Abstract: The present invention relates to the use of nanoscintillation systems, or nanoparticles containing fluor molecules, that can be used to detect an electron-emitting or alpha-particle-emitting radioisotope in the absence of organic-solvents commonly used in organic-based liquid scintillation cocktails. The invention also relates to compositions and use of three oil-in-water microemulsion precursors that can be engineered rapidly, reproducibly, and cost-effectively to produce useful nanoparticles less than 100 nanometers.

Abstract: A portable, self-contained, electronic radioscopic imaging system uses a pulsed X-ray source, a remote X-ray sensor, and a self-contained, display and controller unit to produce, store, and/or display digital radioscopic images of an object under investigation in low voltage imaging environments such as medical applications including mammography and tissue imaging, and industrial radiography of low-density structures, or the like. The radiographic system uses an X-ray converter screen for converting impinging X-ray radiation to visible light, and thus each point impinged on the screen by X-ray radiation scintillates visible light emissions diverging from the screen. An image sensor, i.e., a CCD camera, is configured to sense the visible light from the screen. An aspheric objective lens operable with the CCD camera spatially senses visible light within a collection cone directed outwardly from the image sensor. An emission modification lens layer, e.g.

Abstract: This invention relates to a radiation detection device for detecting ionizing beam discharges such as gamma rays, x-rays, electron beams, charged particle beams and neutral particle beams. Specifically, it relates to a radiation detection device which can measure radiations which exist for a very short time (of the order of subnanoseconds or less) from the appearance of photoemission to extinction.

Abstract: The invention relates to a device for capturing ionizing radiation, in which a substrate which is provided with a phosphor layer is accommodated in a housing. To simplify the device and to ensure a high light yield, the invention provides that a means for buffering the atmospheric humidity is accommodated in the housing.

Abstract: Comprising a first step of supporting a substrate formed with a scintillator on at least three protrusions of a target-support element disposed on a vapor deposition table so as to keep a distance from said vapor deposition table; a second step of introducing said vapor deposition table having said substrate supported by said target-support element into a vapor deposition chamber of a CVD apparatus; and a third step of depositing an organic film by CVD method onto all surfaces of said substrate, provided with said scintillator, introduced into said vapor deposition chamber.

Abstract: A stimulable phosphor sheet is prepared by applying an electron beam to a stimulable phosphor or its source in a vacuum to vaporize a phosphor or its source and depositing the vaporized phosphor or source on the support, under the condition that the electron beam is applied to the stimulable phosphor or source at an accelerating voltage of 1.5 kV to 5.0 kV. The stimulable phosphor or its source is preferably in the form of a solid having a relative density of 80% to 98%.

Abstract: Comprising a first step of supporting a substrate formed with a scintillator on at least three protrusions of a target-support element disposed on a vapor deposition table so as to keep a distance from said vapor deposition table; a second step of introducing said vapor deposition table having said substrate supported by said target-support element into a vapor deposition chamber of a CVD apparatus; and a third step of depositing an organic film by CVD method onto all surfaces of said substrate, provided with said. scintillator, introduced into said vapor deposition chamber.

Abstract: This invention provides a radiation detector using a scintillator having both a strong luminescence intensity and a short time constant.

Abstract: A phosphor screen with metal back of the present invention has a degree of adhesion of 30% or more in the ratio of the contact area of a phosphor layer (2) and a metal back layer (3). The deterioration (film burning) of emission brightness in FED can be suppressed and the brightness characteristics can be improved. The film thickness of the metal back layer is set to 50 to 100 nm and the light transmittance thereof is set to 10% or less to provide a highly bright display with excellent reflectivity. The phosphor screen with metal back can be formed by transferring a metal film onto the phosphor layer formed on the internal surface of a translucent substrate by using a transfer film.

Abstract: The invention is to prevent an interlayer cleavage between a phosphor layer and a moisture-preventing protective layer.

Abstract: A screen panel for converting X-rays into light photons includes a rigid foam plate (2), a first layer (1) of composite material located on one face of the rigid foam plate (2) and a second layer (3) of composite material located on the other face of the rigid foam plate, parallel to the first face. The screen panel applies, for example, to medical radiology and to non-destructive testing of nuclear waste storage packages.

Abstract: A target, which is photographed with an object at a spot for a photogrammtric analytical measurement, comprises first, second, third standard point members and assistant point members. The standard point members and the assistant point members are covered by a reflecting sheet. A distance between the first and second standard point members equals a distance between the second and third standard point members. Two assistant point members are positioned on a first straight line connecting the first and second standard point members. One assistant point member is positioned on a second straight line connecting the second and third standard point members. The distance between the first and second standard point members, the distance between the second and third standard point members, and an angle defined by the first and second straight lines, are predetermined.

Abstract: A device (1) for collecting ionizing radiation comprises a scintillating optical fiber (4) received in an opaque sheath, having a first end (7) for receiving ionizing radiation and a second end (14), the fiber is arranged to convert the ionizing radiation received via its first end into light signals and to deliver the signals via its second end. The device further comprises filter elements (9) placed at the first end (10) of the sheath (3) to prevent external photons (&ngr;) and gamma type (&ggr;) ionizing radiation from gaining access to the first end (7) of the scintillating fiber (4), and at the second end (14) of the scintillating fiber (4), first connection elements (16) suitable for connection to light guide elements (2) for enabling the second end (14) of the fiber to be coupled to the end (17) of a light guide (18) of the light guide elements.

Abstract: A method of fabricating an apparatus for an enhanced imaging sensor consisting of pixellated micro columnar scintillation film material for x-ray imaging comprising a scintillation substrate and a micro columnar scintillation film material in contact with the scintillation substrate. The micro columnar scintillation film material is formed from a doped scintillator material. According to the invention, the micro columnar scintillation film material is subdivided into arrays of optically independent pixels having interpixel gaps between the optically independent pixels. These optically independent pixels channel detectable light to a detector element thereby reducing optical crosstalk between the pixels providing for an X-ray converter capable of increasing efficiency without the associated loss of spatial resolution. The interpixel gaps are further filled with a dielectric and or reflective material to substantially reduce optical crosstalk and enhance light collection efficiency.

Abstract: The invention relates to a storage layer (4) for storing x-ray information, comprising a large number of needle-shaped storage material areas (15A to 15L) for guiding light radiation (17 to 28, 30 to 36, 39). An absorption zone (14A to 14N), which contains absorption material for absorbing light radiation (17 to 23, 30 to 35, 39) lies between the individual needle-shaped storage material areas (15A to 15L). The invention also relates to a device for reading x-ray information from a storage layer of this type and to an x-ray cassette which has a device of this type for reading x-ray information.

Abstract: Crystalline, transparent, rare-earth activated lutetium oxyorthosilicate phosphor. The phosphor consists essentially of lutetium yttrium oxyorthosilicate activated with a rare-earth metal dopant M and having the general formula Lu(2−x−z)YxMzSiO5, wherein 0.00≦x≦1.95, wherein 0.001≦z≦0.02, and wherein M is selected from Sm, Tb, Tm, Eu, Yb, and Pr. The phosphor also consists essentially of lutetium gadolinium oxyorthosilicate activated with a rare-earth metal dopant M and having the general formula Lu(2−x−z)GdxMzSiO5, wherein 0.00≦x≦1.95, wherein 0.001≦z≦0.02, and wherein M is selected from Sm, Tb, Tm, Eu, Yb, and Pr. The phosphor also consists essentially of gadolinium yttrium oxyorthosilicate activated with a rare-earth metal dopant M and having the general formula Gd(2−x−z)YxMzSiO5, wherein 0.00≦x≦1.95, wherein 0.001≦z≦0.02, and wherein M is selected from Sm, Tb, Tm, Eu, Yb, and Pr.

Abstract: An x-ray cassette having increased durability. The x-ray cassette comprises a shell and a storage phosphor assembly. The shell comprises an upper and lower panel, a first and second side member, and a front end member, with the first and second side members and front end member joining the upper and lower panels to define a cavity having an open end. The storage phosphor assembly comprises an insert plate having a first and second side, a back end member having two ends, and a first and second edge insert. The storage phosphor assembly is adapted to be removably contained within the shell such that the back end member closes off the open end of the shell. The first and second edge inserts are affixed to the first and second sides, respectively.

Abstract: A gadolinium oxysulfide phosphor for digital radiography represented by the following compositional formula, which mainly emits a green luminescence under excitation with radiation: (Gd1−x−y−z,Tbx,Dyy,Cez)2O2S wherein x, y and z are numbers which satisfy 1.2×10−3≦x≦1.9×10−2, 5×10−4≦y≦19×10−2 and 10−8≦z≦8×10−7, respectively.

Abstract: Scintillator panel 1 comprises a radiation transmitting substrate 5, which has heat resistance, a dielectric multilayer film mirror 6, as a light reflecting film and is formed on the radiation transmitting substrate 5, and a scintillator 10, disposed on the dielectric multilayer film mirror 6 and emits light by conversion of the radiation 30 that has been made to enter the radiation transmitting substrate 5 and has passed through the dielectric multilayer film mirror 6. Since the radiation transmitting substrate 5 has heat resistance, the dielectric multilayer film mirror 6 can be vapor deposited at a high temperature and, as a result, can be formed in a state of high reflectance. Also, unlike a metal film, the dielectric multilayer film mirror 6 will not corrode upon reacting with the scintillator 10.

Abstract: A radiographic intensifying screen is composed of a support and a phosphor layer. The phosphor layer contains a terbium activated gadolinium oxysulfide phosphor. The screen contains a fluorescent dye or pigment which absorbs a portion of luminescence emitted by the oxysulfide phosphor and then emits a light having an emission peak in the wavelength resion of 490 to 600 nm.

Abstract: Crystalline, transparent, rare-earth activated lutetium oxyorthosilicate phosphor. The phosphor consists essentially of lutetium yttrium oxyorthosilicate activated with a rare-earth metal dopant M and having the general formula Lu(2−x−z)YxMzSiO5, wherein 0.00≦x≦1.95, wherein 0.001≦z≦0.02, and wherein M is selected from Sm, Tb, Tm, Eu, Yb, and Pr. The phosphor also consists essentially of lutetium gadolinium oxyorthosilicate activated with a rare-earth metal dopant M and having the general formula Lu(2−x−z)GdxMzSiO5, wherein 0.00≦x≦1.95, wherein 0.001≦z≦0.02, and wherein M is selected from Sm, Tb, Tm, Eu, Yb, and Pr. The phosphor also consists essentially of gadolinium yttrium oxyorthosilicate activated with a rare-earth metal dopant M and having the general formula Gd(2−x−z)YxMzSiO5, wherein 0.00≦x≦1.95, wherein 0.001≦z≦0.02, and wherein M is selected from Sm, Tb, Tm, Eu, Yb, and Pr.

Abstract: A method of preparing a phosphor layer coating solution of a radiation image conversion panel is provided, in which, at least a phosphor, a binder, a cross-linking agent which cross-links the binder by being heated, and a solvent are constituent components of the phosphor layer coating solution. The method includes a phosphor dispersing step in which the constituent components other than the cross-linking agent are mixed and stirred to disperse the phosphor such that a phosphor dispersion is prepared, a cooling step in which the phosphor dispersion prepared in the phosphor dispersing step is cooled, and a cross-linking agent adding step in which the cross-linking agent is added to the phosphor dispersion cooled in the cooling step and the dispersion is stirred such that the cross-linking agent is thoroughly mixed therewith.

Abstract: A vacuum ultraviolet laser wavelength measuring apparatus capable of accurately measuring wavelength characteristics of a laser beam. The wavelength measuring apparatus has spectral devices for generating an optical pattern corresponding to wavelength characteristics of an incident laser beam and measuring wavelength characteristics of a laser beam in a vacuum ultraviolet region oscillating from a vacuum ultraviolet laser on the basis of the optical pattern. The apparatus has a fluorescent screen for generating a fluorescent pattern having an intensity distribution corresponding to an intensity distribution of the incident optical pattern, a pattern detector for measuring the intensity distribution of the fluorescent pattern, and arithmetic unit for calculating the wavelength characteristics of the laser beam on the basis of the measured intensity distribution.

Abstract: A scintillator panel 1 uses a glass substrate 5, having heat resistance, as a base member for forming a scintillator 10. Glass substrate 5 also functions as a radiation entry window. Also, a dielectric multilayer film mirror 6 is disposed as a light-reflecting film between the scintillator 10 and the glass substrate 5. Furthermore, a light-absorbing film 7 is disposed on the radiation entry surface of glass substrate 5 and this absorbs the light that has been emitted from scintillator 10 and has passed through the dielectric multilayer film mirror 6 and the glass substrate 5. Light components that are reflected by the radiation entry surface, etc., and return to the dielectric multilayer film mirror 7 and the scintillator 10 therefore do not occur and the optical output of the scintillator panel 1 is not subject to degrading effects.

Abstract: Method and devices for measuring spot temperatures and surface temperature distributions using a luminophor, and method and devices for determining temperature-corrected oxygen or surface air pressure distributions using the same oxygen-sensitive luminophor. The luminophor is excited sequentially by a first light of wavelengths &lgr;1 and intensity P1 and a second light of wavelengths &lgr;v and intensity PT·, generating a first luminescence light of intensity I1 and a second luminescence light of intensity IT, respectively. The absorption of light of wavelength &lgr;v is substantially temperature-dependent in such a manner that the ratio (IT·P1/I1·PT) increases substantially in a known manner with increasing temperature, substantially independent of any oxygen pressure, and the oxygen pressure can be determined as a function of the luminescence decay time.

Abstract: A black-light display creates dynamic and animated imagery by employing a UV laser system (14, 16, 18) configured to scan a luminescent material (12) to produce a UV-excited static or dynamic image.

Abstract: A very sensitive dosimeter that detects ionizing radiation is described. The dosimeter includes a breakable sealed container. A solution of a reducing agent is inside the container. The dosimeter has an air-tight dosimeter body with a transparent portion and an opaque portion. The transparent portion includes a transparent chamber that holds the breakable container with the reducing agent. The opaque portion includes an opaque chamber that holds an emulsion of silver salt (AgX) selected from silver chloride, silver bromide, silver iodide, and combinations of them. A passageway in the dosimeter provides fluid communication between the transparent chamber and the opaque chamber. The dosimeter may also include a chemical pH indicator in the breakable container that provides a detectable color change to the solution for a pH of about 3-10.

Abstract: Shown is a flexible scintillator, or scintillation-type level detector, in which the scintillator is made from a plurality of elongated, relatively thin layers of plastic scintillator material stacked in close proximity to one another in a slidable relationship to provide flexibility in at least two dimensions. The layers of at least one end are aligned for operable connection to a photodetector. Optionally, an anti-friction material, such as PTFE, may be placed between layers of the plastic scintillator material. Edge and outer face surfaces of the layers of the scintillator material may be covered with an inwardly facing light reflective material and/or light-excluding material.

Abstract: In order to quickly and economically evaluate cleanliness of a metal with high representativity when quantities, compositions, etc., of non-metallic inclusion particles existing in a metal and resulting in product defects are evaluated by a sample collected during the production process of the metal, the present invention provides an evaluation method involving the steps of levitation-melting a metal piece for a predetermined time by cold crucible levitation-melting means, discharging non-metallic inclusion particles contained in the metal piece to the surface of a molten metal, and directly analyzing a curved and non-smooth sample surface after solidification by a fluorescent X-ray analysis method using an energy dispersion type spectroscope, or by other chemical or physical measurements, to measure or analyze the quantities of elements constituting the non-metallic inclusion particles and to determine quantity of the non-metallic inclusions.

Abstract: A phosphor panel with a protective coating divided in at least two layers, a layer A, being closest to said phosphor layer and a layer B farther away from said phosphor layer wherein the layer A is a layer of parylene.

Abstract: To provide a neutron scintillator, which does not contain a heavy element, which is absolutely necessary in realizing a scintillation detector having low sensitivity to gamma ray and fully capable of counting high intensity neutron, Cu is doped in oxide comprised of Li and B. The oxide comprised of Li and B is a transparent single crystal having composition ratio of Li2B4O7. The neutron scintillator contains Cu by 0.001 to 0.1 wt %. Furthermore, a (001) plane cut off perpendicularly to a growth axis and polished from the single crystal whose orientation has been grown in a <001> axis is made to be a scintillator plate crystal.

Abstract: A microchannel phosphor screen for converting radiation, such as X-rays, into visible light. The screen includes a planar surface, which can be formed from glass, silicon or metal, which has etched therein a multiplicity of closely spaced microchannels having diameters of the order of 40 microns or less. Deposited within each of the microchannels is a multiplicity of phosphors which emit light when acted upon by radiation. The dimensions of the microchannel and the phosphors and the relationship between the microchannels and the phosphors is optimized so that the light output compares favorably with lower resolution non microchannel based scintillation screens. A photomultiplier can be integrated with the X-ray detector so as to provide an enhanced output for use with low level X-ray of for cine or fluoroscopy applications.

Abstract: A gadolinium oxysulfide phosphor for digital radiography represented by the following compositional formula, which mainly emits a green luminescence under excitation with radiation:

Abstract: A supported phosphor screen or panel suitable for use in radiation detectors has been described, as well as a method to prepare said screen or panel, comprising a phosphor layer wherein the phosphor layer has a main surface and edges, and further comprises, as an overcoat layer, a moistureproof protective layer, characterized in that the panel comprises a support with a surface larger than the said main surface of said phosphor layer, so that the said phosphor layer leaves a portion of said support free, and said overcoat layer covers at least a part of said portion of said support left free by said phosphor layer.

Abstract: Automated measurement of changes in detective quantum efficiency (DQE) within an x-ray detector. The calculation of relative DQE changes is limited to the measurement of two quantities, namely MTF(f) and NPS(f). The measurement of MTF is obtained using an image quality phantom technique. The measurement of NPS includes the use of a flat field phantom, and data can be obtained during system calibration. Detector degradation and potential field replacement, are determined by monitoring the ratio of DQE as a function of time.

Abstract: A system and method of computer tomography imaging using a cerium-doped lutetium orthosilicate scintillator are provided. The system includes a high frequency electromagnetic energy projection source to project high frequency energy toward an object, such as a patient. A scintillator array having a plurality of cerium-doped lutetium orthosilicate scintillators therein receives the high frequency energy attenuated by the object and emits light energy based on the attenuated energy received. A photodiode array including a plurality of photodiodes is optically-coupled to the scintillator array and configured to detect the light energy and discharge output to a data processing system to produce a visual display. Each scintillator of the scintillator array is formed into a transparent glass ceramic having a high crystalline phase by combing glass-forming compounds in a glass forming system.

Abstract: Comprising a first step of supporting a substrate formed with a scintillator on at least three protrusions of a target-support element disposed on a vapor deposition table so as to keep a distance from said vapor deposition table; a second step of introducing said vapor deposition table having said substrate supported by said target-support element into a vapor deposition chamber of a CVD apparatus; and a third step of depositing an organic film by CVD method onto all surfaces of said substrate, provided with said scintillator, introduced into said vapor deposition chamber.

Abstract: A radiographic intensifying screen set comprising a pair of a front intensifying screen and a rear intensifying screen, each comprising a support and a plurality of phosphor layers each having a binder resin and a phosphor dispersed therein, provided on the support, wherein at least some of the phosphor layers of the respective front intensifying screen and rear intensifying screen contain a fluorescent dye or a fluorescent pigment which absorbs some of emitted lights from the phosphors and emits lights having other wavelengths, the support for the front intensifying screen is a light-reflective support, and the support for the rear intensifying screen is a light-absorptive support.

Abstract: Electrochemical corrosion of a reflective layer provided in a scintillator panel is prevented. The scintillator panel includes a conductive base member for supporting a wavelength converter layer and a reflective layer for emitting light converted by a phosphor layer to the outside, in which an insulating layer is formed between the conductive base member and the reflective layer. Alternatively, the above problem is solved by a scintillator panel in which the full circumference including the base member surface side of the reflective layer, the wavelength converter layer side of the reflective layer, and end surfaces of the reflective layer is covered with an insulating layer or a protective film for the reflective layer and a radiation imaging device using such a scintillator panel.

Abstract: This disclosure defined by this invention sets forth an X-ray detector including a scintillator. The scintillator is formed with a doped alkali halogenide and is constructed with an array of photodiodes including at least one photodiode containing a semiconductor material with a color transformer. The color transformer contains a photoluminescent phosphor and may be arranged between the scintillator and the array of photodiodes. One benefit of the scintillator, and an x-ray detect which includes the scintillator, is that it enables a larger part of the X-radiation to be used for image analysis.

Abstract: Simultaneous measurement of neutron flux and temperature is provided by a single sensor which includes a phosphor mixture having two principal constituents. The first constituent is a neutron sensitive Li6F and the second is a rare-earth activated Y2O3 thermophosphor. The mixture is coated on the end of a fiber optic, while the opposite end of the fiber optic is coupled to a light detector. The detected light scintillations are quantified for neutron flux determination, and the decay is measured for temperature determination.

Abstract: A scintillator panel (2) comprises a radiation-transparent substrate(10), aflat resin film (12) formed on the substrate (10), a reflecting film (14) formed on the flat resin film (12), a deliquescent scintillator (16) formed on the reflecting film (14), and a transparent organic film (18) covering the scintillator (16).

Abstract: A radiation image sensor has a scintillator panel and an imaging device, and the scintillator panel comprises a radiation-transparent substrate, a deliquescent scintillator formed on the substrate, and an elastic organic film covering the scintillator, the scintillator panel and imaging device being bonded to each other with a matching oil interposed therebetween, whereas side wall portions of the scintillator panel and imaging device are firmly attached to each other with a resin.

Abstract: A novel phosphor represented by the general formula (Gd1−xCex)3Al5−yGayO12 (wherein x and y are values falling in the ranges of 0.0005≦x≦0.02, and 0<y<5.) was provided. The phosphor has a high luminous efficiency when Al and Ga are coexistent in the Gd-system phosphor. In particular, the phosphor with the Ga content (y) in the range of 2-3 has a luminous efficiency of twice the conventional phosphor. A radiation detector using this phosphor as ceramic scintillator is capable of obtaining a high luminous output and a very small afterglow.

Abstract: The present invention concerns a screen panel for converting X-rays into light photons. The panel comprises a rigid foam plate (2), a first layer (1) of composite material located on one face of the rigid foam plate (2) and a second layer (3) of composite material located on the other face of the rigid foam plate, parallel to the said first face.

Abstract: A composite phosphor screen for converting radiation, such as X-rays, into visible light. The screen includes a planar surface, which can be formed from glass, silicon or metal, which has etched therein a multiplicity of closely spaced microchannels having diameters of the order of 10 microns or less. Deposited within each of the microchannels is a multiplicity of phosphors which emit light when acted upon by radiation. A photomultiplier, which may be microchannel based, is integrated with the X-ray detector so as to provide an enhanced output for use with low level X-ray of for cine or fluoroscopy applications. The walls of the microchannels and/or the substrate surfaces include dielectric stack based light reflective coatings.

Abstract: To provide simpler, more efficient methods for making scintillator arrays, one embodiment of the present invention is a method for making a scintillator array. The method includes extruding a mixture of a scintillator powder and a binder into rods; laminating the extruded rods with a sinterable reflector material; and sintering the laminated rods and reflector material into a scintillator block. Scintillator array embodiments of the present invention are useful in many types of pixelated radiation detectors, such as those used in computed tomography systems.

Abstract: A downhole optical apparatus includes an LED source, reflectance and fluorescence detectors, a plurality of fibers, a dichroic mirror (DM), a beam splitter/coupler, a probe, a short-pass filter (SP), a dichroic long-pass filter (LP), and a lens. Source light filtered by the SP is fed to the DM which deflects light of desired wavelengths only. The deflected light is focused by the lens onto a fiber and is ultimately injected into an oil flow by the probe. Light reflected by oil or fluorescing therefrom is received by the probe, and split by the splitter. A small portion is received by the reflectance detector. A large portion is received by the lens and directed to the DM which deflects reflected light and passes light at longer fluorescing wavelengths. Passed light is further filtered by the DM and LP to eliminate remnants of the reflected light, and provided to the fluorescence detector.

Abstract: A monoclinic single crystal with a lutetium pyrosilicate structure is described. The crystal is formed by crystallization from a congruent molten composition of LU2(1−x)M2x Si2O7 where LU is lutetium or a lutetium-based alloy which also includes one or more of scandium, ytterbium, indium, lanthanum, and gadolinium; where M is cerium or cerium partially substituted with one or more of the elements of the lanthanide family excluding lutetium; and where x is defined by the limiting level of LU substitution with M in a monoclinic crystal of the lutetium pyrosilicate structure. The LU alloy should contain greater than about 75 weight percent lutetium. The crystals exhibit excellent and reproducible scintillation response to gamma radiation.

Abstract: A photosensitive matrix sensor include a faceplate of caesium iodide CsI mounted on a graphite base so as to transform high-frequency radiation, X-ray radiation, into low-frequency radiation, in the visible spectrum. It is shown that if the CsI is grown on such a graphite base, a sensor with much better resolution and much better sensitivity is obtained than if a gadolinium oxysulphide scintillator were used. Precautions in preparing the graphite may furthermore be taken rendering the surface of the graphite denser. It can thus be covered with a layer of amorphous carbon and or be made to undergo impregnation. This densification contributes to the homogeneity of the sensor. Protection of the CsI is then effected by a synthetic resin layer allied with a layer of liquid resin for optical coupling with a detector.