Abstract: A wavelength conversion structure includes a light guide formed of a light-transmissive member having a laser light incident port that allows the laser light to be introduced and a phosphor-containing layer that covers at least part of the surface of the light guide. The light guide has a light diffusing structure having asperities and a light reflecting film. The asperities are formed over the surface of the light guide except a laser light incident surface having the laser light incident port. The light reflecting film is formed over the surface of the light guide along the asperities except the laser light incident port and the portion covered with the phosphor-containing layer.

Abstract: This invention provides a radiographic imaging device, having: a scintilator layer which converts transmitted radiation incident with emission of radiation to an imaging target to light; a first organic photoelectric conversion layer which is continuous and converts a first light containing the maximum peak wavelength from the scintilator layer to a charge; an insulating substrate having a storage capacitor and a thin film transistor for reading the charge generating in the first organic photoelectric conversion layer for each image detection pixel; a second organic photoelectric conversion layer which converts a second light from the scintilator layer to a charge; and a radiation dose detection circuit for reading the charge generating in the second organic photoelectric conversion layer for each radiation dose detection pixel and a radiographic imaging system using the same.

Abstract: The invention relates to a portable mini gamma camera for intrasurgical use. The inventive camera is based on scintillation crystals and comprises a stand-alone device, i.e. all of the necessary systems have been integrated next to the sensor head and no other system is required. The camera can be hot-swapped to any computer using different types of interface, such as to meet medical grade specifications. The camera can be self-powered, can save energy and enables software and firmware to be updated from the Internet and images to be formed in real time. Any gamma ray detector based on continuous scintillation crystals can be provided with a system for focusing the scintillation light emitted by the gamma ray in order to improve spatial resolution. The invention also relates to novel methods for locating radiation-emitting objects and for measuring physical variables, based on radioactive and laser emission pointers.

Abstract: A multi-element X-ray radiation detector consists of a flat multi-element scintillator in the form of a discrete set of hetero-phase luminescent elements which are arranged in the cells of a mesh made from a metal which absorbs X-ray radiation and reflects light, the increment size of which mesh corresponds to the increment size of the photo receiver matrix. The metallic mesh that forms the multi-element luminescent scintillator is made from elements having an atomic number from N=26 (iron) to N=74 (tungsten), has silver-plated coils, and separates the scintillator elements optically from one another. The process of synthesis is carried out in two stages. Oxyhalides of elements making up a cationic subgroup are formed by reacting an initial coprecipitated oxides of rare earth elements, Bi and Re, with ammonium halides. The resulting product is then subjected to repeated thermal treatment in an alkali chalcogenide melt.

Abstract: Radioimaging methods, devices and radiopharmaceuticals therefor.

Abstract: This aims to provide a DOI type radiation detector in which scintillation crystals arranged two-dimensionally on a light receiving surface to form rectangular section groups in extending directions of the light receiving surface of a light receiving element are stacked up to make a three-dimensional arrangement and responses of the crystals that have detected radiation are made possible to identify at response positions on the light receiving surface, so that a three-dimensional radiation detection position can be obtained. In the DOI type radiation detector, scintillation crystals are right triangle poles extending upwards from the light receiving surface and the response positions on the light receiving surface are characterized. With this structure, DOI identification of a plurality of layers can be carried out by simply performing an Anger calculation of a light receiving element signal.

Abstract: In nuclear imaging, when a gamma ray strikes a scintillator, a burst of visible light is created. That light is detected by a photodetector and processed by downstream electronics. It is desirable to harness as much of the burst of light as possible and get it to the photodetector. In a detector element (18), a first reflective layer (44) partially envelops a scintillation crystal (34). The first reflective layer (44) diffuses the scintillated light. A second reflective layer (46) and a support component reflective layer (48) prevent the light from leaving the scintillation crystal (34) by any route except a light emitting face (36) of the scintillator (34). In another embodiment, a light concentrator (50) is coupled to the scintillator (34) and channels the diffuse light onto a light sensitive portion of a photodetector (38). The reflective layers (44, 46, 48) and the concentrator (50) ensure that all or nearly all of the light emitted by the scintillator (34) is received by the photodetector (38).

Abstract: A detector and associated method are provided including a first scintillation material having a light yield temperature dependence and an output at a first energy level, a second scintillation material having a light yield temperature dependence similar to the first material and an output at a second energy level, and detection circuitry. The first and second outputs are responsive to radiation emitted from an ionizing radiation source. The detection circuitry includes a photo multiplier tube configured to convert photon outputs from the first and second scintillating materials to electrical pulses, a counter circuit configured to count the electrical pulses generated in the photo multiplier tube by the first and second materials, and a gain control circuit configured to monitor the electrical pulses generated in the photomultiplier tube by the second material and adjust a gain of the detector upon detecting a drift in the output of the second material.

Abstract: A flat panel X-ray detector that comprises an X-ray panel and a scintillator layer disposed on a first surface of the X-ray panel, is disclosed herein. The flat panel X-ray detector further comprises a hermetic cover that covers the scintillator layer. The hermetic cover comprises a top surface and at least one sidewall extending away from the top surface. The flat panel X-ray detector further comprises a solder seal disposed between the hermetic cover and the X-ray panel. A rim of the sidewall is substantially embedded within the solder seal such that the rim does not directly contact the X-ray panel. A method for fabricating a flat panel X-ray detector is also disclosed.

Abstract: A radiation-sensitive detector includes a photosensor layer with one or more photosensor dixels and a composite scintillator layer with one or more scintillator dixels optically coupled to the photosensor layer. The composite scintillator layer is formed from a mixture including a scintillator material having a first refractive index corresponding to a first wavelength and a photo-resist used in micro-electromechanical systems production, having a second refractive index corresponding to the first wavelength. The first and second refractive indices are substantially matched, and the composite scintillator layer produces light having the first wavelength and that is indicative of x-radiation detected thereby.

Abstract: The present invention relates to quaternary compound scintillators and related devices and methods. The scintillators may include, for example, a mixed halide scintillator composition including at least two different CsLiLa halide compounds and a dopant. Related detection devices and methods are further included.

Abstract: A family of photodetectors includes at least first and second members. In one embodiment, the family includes members having different pixel sizes. In another, the family includes members having the same pixel size. The detection efficiency of the detectors is optimized to provide a desired energy resolution at one or more energies of interest.

Abstract: A fluorescent material for a scintillator to be used in a radiation detector is provided. The fluorescent material is designed to have a high fluorescent intensity and a low level of afterglow a short term of 1 to 300 ms after the termination of X-ray radiation. The above fluorescent material contains Ce as an activator. In addition, the material must contain at least Gd, Al, Ga, O, Fe, and a component M. The component M is at least one of Mg, Ti, and Ni. In addition, the composition of the material must be expressed by the general formula: (Gd1-x-zLuxCez)3+a(Al1-u-sGauScs)5?aO12 wherein 0?a?0.15, 0?x?0.5, 0.0003?z?0.0167, 0.2?u?0.6, and 0?s?0.1, and wherein, regarding the concentrations of Fe and M, Fe: 0.05?Fe concentration (mass ppm)?1, and 0?M concentration (mass ppm)?50.

Abstract: A radiation detector includes an array of detector pixels each including an array of detector cells. Each detector cell includes a photodiode biased in a breakdown region and digital circuitry coupled with the photodiode and configured to output a first digital value in a quiescent state and a second digital value responsive to photon detection by the photodiode. Digital triggering circuitry is configured to output a trigger signal indicative of a start of an integration time period responsive to a selected number of one or more of the detector cells transitioning from the first digital value to the second digital value. Readout digital circuitry accumulates a count of a number of transitions of detector cells of the array of detector cells from the first digital state to the second digital state over the integration time period.

Abstract: In one aspect a scintillation array includes a transparent material between portions of adjacent scintillation pixels. The transparent material can allow light to pass from one scintillation pixel to an adjacent scintillation pixel. The resulting image provides information regarding the depth at which a scintillation event occurs. Another aspect regards a scintillation array that includes reflector strips separating portions of adjacent scintillation pixels. Other spaces between portions of scintillation pixels need not include reflector strips and may be filled with other reflective material.

Abstract: A radiation detector includes an array of detector pixels each including an array of detector cells. Each detector cell includes a photodiode biased in a breakdown region and digital circuitry coupled with the photodiode and configured to output a first digital value in a quiescent state and a second digital value responsive to photon detection by the photodiode. Digital triggering circuitry is configured to output a trigger signal indicative of a start of an integration time period responsive to a selected number of one or more of the detector cells transitioning from the first digital value to the second digital value. Readout digital circuitry accumulates a count of a number of transitions of detector cells of the array of detector cells from the first digital state to the second digital state over the integration time period.

Abstract: A digital radiography detector includes a housing having first and second spaced planar members and four side walls defining a cavity. A radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a detector array mounted on a stiffener. A shock absorbing elastomer assembly is located within the cavity for absorbing shock to the detector array/stiffener in directions perpendicular to and parallel to the detector array/stiffener.

Abstract: Exemplary embodiments provide a radiographic array, flat detector panel and/or X-ray imaging apparatus including the same and/or methods for using the same or calibrating the same. Exemplary embodiments can reduce or address noise occurring in the optically sensitive pixels that is temporally not related to image data detected by the optically sensitive pixels or dark reference frames detected by the optically sensitive pixels. Exemplary embodiments can include a capacitive element in a calibration pixel coupled between a row conductive line and a column conductive line in an imaging array.

Abstract: A medium area (S) filled with liquid xenon (2) is formed between an external cylindrical body (1a) and internal cylindrical body (1b), and a pair of anode pads (11, 12) are disposed in two-dimensional form in opposite end portions of the medium area (S) in the intersection direction with respect to the gamma-ray incident direction. An intermediate electrode (10) is disposed between a pair of anode pads (11, 12), and a plurality of photomultiplier tubes (5) is installed in two-dimensional form in the external cylindrical body (1a). Then, the gamma-ray reaction point within the liquid area (S) is identified from signals output from the anode pads (11, 12) and photomultiplier tubes (5).

Abstract: The invention relates to a radiation detector and a method for producing such a detector, wherein the detector comprises a stack of the scintillator elements and photodiode arrays. The PDAs extend with electrical leads into a rigid body filling a border volume lateral of the scintillator elements, wherein said leads end in a contact surface of the border volume. Moreover, a redistribution layer is disposed on the contact surface, wherein electrical lines of the redistribution layer contact the leads of the PDAs.

Abstract: An electron detector includes a plurality of assemblies, the plurality of assemblies including a first assembly having a first SiPM and a first scintillator made of a first scintillator material directly connected to an active light sensing surface of the first SiPM, and a second assembly having a second SiPM and a second scintillator made of a second scintillator material directly connected to an active light sensing surface of the second SiPM, wherein the first scintillator material and the second scintillator material are different than one another. Alternatively, an electron detector includes an assembly including an SiPM and a scintillator member having a front surface and a back surface, the scintillator member being a film of a scintillator material directly deposited on to an active light sensing surface of the SiPM.

Abstract: Disclosed are a radiation image conversion panel which has achieved a radiation image with enhanced sharpness and improved moisture resistance and shock resistance, and a production method thereof. The radiation image conversion panel comprises, on a support, a phosphor layer comprising phosphor columnar crystals, each composed mainly of cesium iodide (CsI) and formed by a process of gas phase deposition, wherein a coefficient of variation of crystal diameter of the phosphor columnar crystals is not more than 50% and a coefficient of variation of phosphor filling factor of the phosphor layer is not more than 20%.

Abstract: A radiation detection apparatus comprises a plurality of pixels each including a conversion element which converts incident radiation into a charge, a switching element which transfers the charge, and an interlayer insulation film disposed between the conversion element and the switching element, a gate line to drive the switching element, and a signal line located to intersect with the gate line and configured to read out the charge transferred from the switching element, wherein Ca??0×?×S/d and 7d?P/2 is satisfied, where P is a pixel pitch, Ca is a sum total of coupling capacitances between the signal line and the gate line, S is an overlapping area of the signal line and the conversion element, d is a thickness of the interlayer insulation film, ? is a relative dielectric constant of the interlayer insulation film, and ?0 is a vacuum dielectric constant.

Abstract: The present invention relates to scintillator compositions and related devices and methods. The scintillator may include, for example, a mixed scintillator composition including at least two different CsXLa halide compounds and a dopant, wherein X is Na or Li. Related radiation detection devices and methods are further included.

Abstract: A method of fabricating a scintillator includes forming a green part comprised of a nanometer-sized powder, sintering the green part at a first temperature for a first time period, and sintering the green part at a second temperature for a second time period.

Abstract: A dental radiology apparatus having: an intraoral sensor comprising a detector including an active pixel array produced using biCMOS technology and converting a received x-ray into at least one analog electrical output signal; an electronic module encapsulated in a case and which has at least one detector activation device, the module linked to the sensor for the transmission to the sensor of a detector activation signal generated in the module and for the transmission to the module of the at least one analog electrical output signal, the module having analog-digital means for converting the at least one analog electrical output signal into at least one digital output signal. A remote processing and display unit of the at least one digital output signal is linked to the electronic module to ensure the transmission to the unit of the at least one digital output signal.

Abstract: The scintillator plate has a reflective layer, a resinous anti-corrosion layer and a scintillator layer provided sequentially in that order on a heat resistant resin substrate. The scintillator plate is employed as a component for a flat panel radiation detector. The scintillator plate has a protective film between the scintillator layer and the flat light receiving element which makes up the flat panel radiation detector. There is point contact between the surface of the scintillator layer and the protective film and there is point contact between the flat light receiving element and the protective film.

Abstract: In nuclear imaging, solid state photo multipliers (48) are replacing traditional photomultiplier tubes. One current problem with solid state photomultipliers, is that they are difficult to manufacture in the size in which a typical scintillator is manufactured. Resultantly, the photomultipliers have a smaller light receiving face (50) than a light emitting face (46) of the scintillators (44). The present application contemplates inserting a reflective material (52) between the solid state photomultipliers (48). Instead of being wasted, light that initially misses the photomultiplier (48) is reflected back by the reflective material (52) and eventually back to the radiation receiving face (50) of the photomultiplier (48).

Abstract: A probe for detecting K-alpha photon emissions. A housing has an aperture at an end. A detector crystal is situated within the housing adjacent to the housing aperture. An energy conversion device is situated within the housing between the detector crystal and the aperture. The energy conversion device is made from a predetermined material configured to convert energy directed through the housing aperture from a source of primary photon emission radiation to a corresponding secondary K-alpha emission within a predetermined emission energy acceptance window. A power supply is coupled to the detector crystal and is configured to establish a polarized electrical field between the anode and the cathode of the detector crystal. The detector crystal receives the K-alpha emission and generates an electrical signal representative of the amount of target emissions received through the housing aperture.

Abstract: A neutron source illuminates suspect material leading to emission of gamma rays characteristic of the isotopes present. The system measures Compton scattering of emitted gamma rays using detectors with three dimension event localization capability. Detection does not require full energy deposition. A spatial correlation of projection vectors is computed by a reconstruction that searches for solutions that generate spatial correlation. Identification and location for contraband material is determined from solutions that generate spatial correlation.

Abstract: A detection device with at least one detector and a processing unit for processing signals of the detector is disclosed. In at least one embodiment, the detection device includes at least one cooling unit for cooling the detector and the processing unit. A shielding is provided for the detector and the processing unit. The shielding includes at least two linked sections, of which a first section has a higher electrical conductivity than a second section, the second section being in thermal contact with the cooling unit.

Abstract: An embodiment of the invention relates to a radiation detector which includes a plurality of radiation detector modules arranged adjacent to one another with in each case one scintillation element with a radiation inlet surface aligned transversely with respect to a main direction of a radiation, and light detector arrangements arranged transversely with respect to the radiation inlet surfaces of the scintillation elements. In the process of at least one embodiment, one light detector arrangement is arranged between two scintillation elements and has two light inlet surfaces which point away from one another, of which one is associated with a first scintillation element and one is associated with a second scintillation element. Furthermore, at least one embodiment of the invention relates to a light detector arrangement, a production method for a radiation detector according to at least one embodiment of the invention and/or an imaging system.

Abstract: A cassette type radiographic image solid-state detector includes: a detector unit having a scintillator for converting incident radiation into light and a detection section which receives and converts the light converted by the scintillator into electric signals; and a housing containing the detector unit, the housing having a rectangular tubular housing body which has openings at both ends and is formed in a rectangular tube shape using carbon fiber, and a first cover member and a second cover member for covering the openings of the rectangular tubular housing body, wherein a wall of the rectangular tubular housing body facing to a direction perpendicular to an incident direction of radiation is thicker than a wall of the rectangular tubular housing body facing to the incident direction of radiation.

Abstract: Embodiments of sensor systems and related methods of operating and manufacturing the same are described herein. The sensor systems can be used to detect atomic or subatomic particles or radiation. Other embodiments and related methods are also disclosed herein.

Abstract: An method for automatically testing an arc flash detection system by periodically or continually transmitting electro-optical (EO) radiation through one or more transmission cables electro-optically coupled to respective EO radiation collectors. A test EO signal may pass through the EO radiation collector to be received by an EO sensor. An attenuation of the EO signal may be determined by comparing the intensity of the transmitted EO signal to an intensity of the received EO signal. A self-test failure may be detected if the attenuation exceeds a threshold. EO signals may be transmitted according to a particular pattern (e.g., a coded signal) to allow an arc flash detection system to distinguish the test EO radiation from EO radiation indicative of an arc flash event.

Abstract: A dental radiology apparatus having: an intraoral sensor comprising a detector that includes an active pixel array produced using biCMOS technology and converting a received x-ray into at least one analog electrical output signal; an electronic module encapsulated in a case and which has at least one detector activation device, the module being linked to the sensor by a wire link for the transmission to said sensor of a detector activation signal generated in the module and for the transmission to the module of said at least one analog electrical output signal, the module having analog-digital means for converting said at least one analog electrical output signal into at least one digital output signal; and a remote processing and display unit of said at least one digital output signal which is linked to the electronic module by a wire link intended to ensure the transmission to the unit of said at least one digital output signal.

Abstract: A system, method, and mobile frame structure detect radiation and identify materials associated with radiation that has been detected. A mobile frame structure is maneuvered over an entity to be examined. A set of radiation data associated with the entity is received from a set of radiation sensors that are mechanically coupled to the at least one portion of the mobile frame structure. At least one histogram is generated based on the set of radiation data. The at least one histogram is compared to multiple spectral images associated with known materials. The at least one histogram is determined to substantially match at least one of the multiple spectral images. A determination is made whether a material associated with the at least one of the multiple spectral images is a hazardous material. Personnel is notified that the at least one radiation source is a hazardous material.

Abstract: A radioactivity measuring apparatus with a rotating stage for waste drums is provided, which includes a case, a plurality of radioactive counters, a rotation unit, and a control unit. The case has an opening and an accommodating space in communication with the opening. A shielding gate is connected to one side of the opening. The plurality of radioactive counters is disposed in the accommodating space, and used for detecting a radioactive counting associated with a sample. The rotation unit is disposed at a wall on a side of the shielding gate corresponding to the opening, and used for supporting the sample. The control unit is electrically connected to the rotation unit and the plurality of radioactive counters, and used for controlling the rotation unit to rotate by a control signal, so as to enable the sample to rotate within the accommodating space.

Abstract: Provided are a gamma ray detector and a gamma ray reconstruction method which can be used in SPECT and PET and which combine and reconstruct the information on “Compton-scattered” gamma rays, thereby remarkably increasing gamma ray detection sensitivity, decreasing the amount of a radioactive substance given to a subject, and remarkably reducing the concern about the amount of radiation exposure. The gamma ray detector comprises an absorber scintillator 12 made from an absorptive substance exhibiting a high rate of absorption with respect to gamma rays 1 in an energy region, emitted from a subject, a Compton scattering scintillator 14 made from a Compton scattering substance exhibiting a high probability of Compton scattering, and an energy detector 16 which combines the amounts of gamma ray energy absorption simultaneously measured by the two types of scintillators to reconstruct the gamma rays emitted from the subject.

Abstract: A radiation-sensitive detector includes a photosensor layer with one or more photosensor dixels and a composite scintillator layer with one or more scintillator dixels optically coupled to the photosensor layer. The composite scintillator layer is formed from a mixture including a scintillator material having a first refractive index corresponding to a first wavelength and a photo-resist used in micro-electromechanical systems production, having a second refractive index corresponding to the first wavelength. The first and second refractive indices are substantially matched, and the composite scintillator layer produces light having the first wavelength and that is indicative of x-radiation detected thereby.

Abstract: Systems, methods and apparatus are provided through which in some embodiments indiscriminate correction of unintended charge in a digital X-ray detector is reduced by analyzing an unintended charge of a digital X-ray detector; and determining a significance of the unintended charge.

Abstract: High rate radiation detectors are disclosed herein. The detectors include a detector material disposed inside the container, the detector material containing cadmium, tellurium, and zinc, a first dopant containing at least one of aluminum, chlorine, and indium, and a second dopant containing a rare earth metal. The first dopant has a concentration of about 500 to about 20,000 atomic parts per billion, and the second dopant has a concentration of about 200 to about 20,000 atomic parts per billion.

Abstract: LSO scintillation crystals with improved scintillation and optical properties are achieved by controlled co-doping a LSO crystal melt with amounts of cerium and an additional codopant such as calcium or other divalent cations. Crystal growth atmosphere is optimized by controlling the amount of oxygen in the atmosphere. Zinc is added as an additional material to restabilize crystal growth where calcium co-dopant is added. The decay time of the scintillation crystal can be controlled by controlling the concentration of co-dopant added.

Abstract: The present invention provides a detection element that can suppress generation of a residual image. A sensor portion includes a semiconductor layer, an upper electrode and a lower electrode. The semiconductor layer generates charges due to light being illuminated thereto. The upper electrode applies a bias voltage to the semiconductor layer. The lower electrode collects charges that have been generated at the semiconductor layer. The charges that have been generated at the semiconductor layer are collected and accumulated by the lower electrode. In the detection element, a saturation prevention circuit (diode and second bias line) is provided through which the accumulated charges flow-out when the charges that have been generated at the semiconductor layer are collected and a voltage level of the lower electrode becomes a saturation prevention voltage level Vs.

Abstract: A radiation detector device is disclosed and includes a scintillation device having a scintillator crystal. The radiation detector device also includes a photosensor. Further, the radiation detector device includes an optical interface coupled between the scintillation device and the photosensor. The optical interface is electrically conductive.

Abstract: The present invention relates to a method of fabricating a radiation detector comprising a photosensitive sensor assembly (1, 4), a scintillator (6) that converts the radiation into radiation to which the photosensitive sensor assembly (1, 4) is sensitive, the scintillator (6) being fastened by adhesive bonding to the sensor assembly, the sensor assembly comprising a substrate (4) and several attached sensors (1), the sensors (1) each having two faces (11, 12), a first face (11) of which is bonded to the substrate (4) and a second face (12) of which is bonded to the scintillator (6). The method consists in linking the following operations: the sensors (1) are deposited via their second face (12) on an adhesive film (13); and the sensors (1) are bonded via their first face (11) to the substrate (4).

Abstract: The present invention is a photodetector including improved photosensors configured of an array of small (sub-millimeter) high-density avalanche photodiode cells utilized to readout a single scintillator. Each photosensor comprises a plurality of avalanche photodiodes cells arranged in an (n×n) array of avalanche photodiode cells (where, n>1) that are coupled to a single scintillation crystal. The overall (n×n) array area as the photosensor is the same as the area of a face of the scintillator and each avalanche photodiode cell has a surface area that is not greater than one square millimeter. The photosensor is also configured to facilitate reading the output of each avalanche photodiode cell in the array. By reading out each small avalanche photodiode cell independently, the noise and capacitance are minimized and thereby provide a more accurate determination of energy and timing.

Abstract: The present invention relates to scintillator compositions and related devices and methods. The scintillator may include, for example, a mixed halide scintillator composition including at least two different CsNaLa halide compounds and a dopant. Related radiation detection devices and methods are further included.

Abstract: The invention relates to a neutron detector for detection of neutrons in fields with significant ?- or ?-radiation, comprising a neutron sensitive scintillator crystal, providing a neutron capture signal being larger than the capture signal of 3 MeV ?-radiation, a semiconductor based photo detector being optically coupled to the scintillator crystal, where the scintillator crystal and the semiconductor based photo detector are selected so that the total charge collection time for scintillator signals in the semiconductor based photo detector is larger than the total charge collection time for signals generated by direct detection of ionizing radiation in the semiconductor based photo detector, the neutron detector further comprising a device for sampling the detector signals, a digital signal processing device, means which distinguish direct signals from the semiconductor based photo detector, caused by ?- or ?-radiation and being at least partially absorbed in the semiconductor based photo detector, from lig

Abstract: An idling time period after applying a bias to a conversion element until a start of an accumulation of the conversion element for deriving an image and an accumulation period from the start of the accumulation to a termination of the accumulation are measured. An offset correction of the image is conducted by using a dark current accumulation charge quantity in the accumulation calculated based on the measured idling time period and accumulation period and stored dark current response characteristics. Thus, even just after applying the bias to the conversion element, the offset correction can be properly conducted. An imaging apparatus which can execute a good radiographing without increasing costs and a size even just after applying the bias to the conversion element is provided.