Abstract: Apparatus having reduced background for measuring radiation activity in aerosol particles. A continuous air monitoring sampler is described for use in detecting the presence of alpha-emitting aerosol particles. An inlet fractionating screen has been demonstrated to remove about 95% of freshly formed radon progeny from the aerosol sample, and approximately 33% of partially aged progeny. Addition of an electrical condenser and a modified dichotomous virtual impactor are expected to produce considerable improvement in these numbers, the goal being to enrich the transuranic (TRU) fraction of the aerosols. This offers the possibility of improving the signal-to-noise ratio for the detected alpha-particle energy spectrum in the region of interest for detecting TRU materials associated with aerosols, thereby enhancing the performance of background-compensation algorithms for improving the quality of alarm signals intended to warn personnel of potentially harmful quantities of TRU materials in the ambient air.

Abstract: The invention provides an ultraviolet remote visual inspection system which enables the operator to detect minute cracks and hairline flaws in normally inaccessible places of manufactured parts. The system includes a fiberscope in combination with a source of white light and ultraviolet light and a plurality of cannisters for holding dye penetrant and other materials which can be used to facilitate the inspection. The fiberscope includes an articulated probe having a working channel, an ultraviolet light guide and an objective lens. The plurality of cannisters are connected to the working channel through a manifold. Dye penetrant, cleaning solution, drying air and developer can be individually delivered to the remote surface to be tested through the working channel from the cannisters. The fiberscope is provided with an adjuster for bending the articulated probe in different directions to facilitate application of the aforesaid materials and the subsequent visual inspection.

Abstract: A mass spectrometer system including a device for supplying a protonated ion species; a single chamber having an entrance and an exit slit, the chamber receiving the supplied protonated ion and transmitting a reprotonated ion through the exit slit; a device for supplying a predetermined reagent gas within the chamber; a device for supplying an electron beam in said chamber such that the electron beam reacts with the supplied predetermined reagent gas to provide neutral reagent gas and protonated reagent gas within the chamber, the supplied ion species reacting with the neutral reagent gas to neutralize the ion species, thereby providing neutral species within the chamber, the neutral species reacting with the protonated reagent gas to provide reionized species within the chamber; and a device, coupled to the exit slit of the chamber, for extracting the reionized species.

Abstract: This invention relates to a method of forming a two-dimensional concentration distribution image of specific ions to be assayed in a living cell, on the basis of the variation in fluorescent spectrum or excitation spectrum of a fluorescent probe.

Abstract: An infrared imaging system including a fixed magnification telescope, a two-axis variable angle scanner, a plurality of differently-sized infrared detectors positioned in the focal plane of the scanner, a selector to choose an output signal provided by one of the detectors, and a raster scan display. A single detector is associated with a particular desired field of view, with the size of the detector chosen to provide the desired resolution. To decrease the field of view encompassed by the imaging system, and thereby magnify the scene presented on the display, a smaller scan angle and a smaller detector are simultaneously selected. A gain and bandwidth normalization circuit is optionally used to normalize the electrical signals output by the various detectors. This arrangement allows reducing the field of view with a simultaneous change in the instantaneous field of view, so that resolution of a picture in the display accordingly increases.

Abstract: The invention relates to a corpuscular beam device, such as an ion beam dce or an electron beam device, in which a primary corpuscular beam is focussed by means of an objective lens onto a sample. The secondary radiation emitted at the point of impact of the primary beam is accelerated onto the central electrode of the objective lens, this electrode being coated with scintillation material, and there produces light pulses which are converted by a light-sensitive detector into electrical signals and amplified.

Abstract: Prior to the transportation to a discharge site of a casket or flask in which has been placed a container filled with radioactive waste, through a hole formed in the flask is introduced a probe holder (32) connected by electrical connectors (76,80) to an external measuring apparatus. The probe holder (31) is provided with a handle (68) making it possible, through a mechanism (66,56,54,50), to swing a door (42) to which a probe (34) is fixed between a retracted introduction position and a measuring position in which the probe can be oriented at 90.degree. relative to the probe holder axis. After the probe holder has been coupled by a nut (40) to a container carrier in which is located the container containing the waste, a precise, reproducible measurement of the dose rate within the transportation flask can be carried out.

Abstract: A scintillation camera comprises a gantry having a plurality of detectors, and a plurality of sections which are assigned to the respective detectors, and to which a plurality of collimators are intended to be attached. A carrier simultaneously supports the collimators to attach them to their attaching-sections respectively, while the carrier simultaneously supports the collimators which have been attached to their attaching-sections, to detach them therefrom. The attaching or detaching of plural collimators can be simultaneously done by only one carrier. Therefore, the time needed to change the collimators can be decreased and the operation of changing them can be made extremely easier. As the result, the efficiency of changing them can be greatly enhanced.

Abstract: A radiation meter suitable for use as a personal dosemeter comprises a first photo diode having a larger effective sensitive area than a second photo diode and provided with a thin metallic shield attenuating radiation incident on the first diode. A capacitor is connected in series with the first photo diode, the first photo diode and the capacitor being connected in parallel with the second photo diode. The first diode and the capacitor provide an output which falls with incident radiation energy whereas the second photo diode provides an output which increases with radiation energy so that the combined output is substantially uniform with respect to radiation energy. Means are provided for counting pulses produced in the common output so as to obtain a measure of radiation dose monitored by the radiation detector.

Abstract: A radiation imaging sensor including laminate structure of a phosphorescent layer, a light-transmissive electrode, a photoconductor layer, an insulating layer and an electrode, an applied voltage to the photoconductor layer through the light-transmissive electrode and the electrode is increased sufficiently so that light emitted from the phosphorescent member causes avalanche multiplicaton of the electrons and/or positive holes generated in the photoconductor layer by field sweep inside the photoconductor layer.

Abstract: A pulse height analyzer for spectrocopy thermal multigate decay well logging systems is disclosed and has an input section comprising a peak time determining circuit locating a peak occurrence. The peak is determined relative to a threshold voltage determining circuit. On peak detection, a timing signal is formed for a control circuit. This operates a sample and hold switch at the output of an amplifier for the input. This switch inputs to an A/D converter driving a buffer. Various handshake signals cooperate with a telemetry system to transfer the peak time A/D valve for pulse height measurement.

Abstract: A photometric analyzer for measuring differential total reduced sulfur in a sample gas stream is provided. It includes a supply for a sulfur bearing gas sample, an oven having an inlet connected to the supply for converting TRS to SO.sub.2 and an outlet through which the gas sample is discharged. A valve is connected to the outlet of the oven. An SO.sub.2 bypass line is connected between the supply and the valve. A sample cell with transparent ends has an inlet adjacent one end connected to the valve for alternately receiving sample gas from either the oven or the bypass line and has an outlet adjacent the other end. A pump connected to the sample cell outlet draws the gas sample through the sample cell. A light source at the one end of the sample cell directs light of a predetermined wave length through the sample cell. A light sensing device at the other end detects the amount of light passing through the sample cell at any given time and provides an output signal to an analyzer.

Abstract: An infrared rays detecting apparatus is disclosed wherein the area of a loop provided by an element line and a grounding line formed on an inner tube is minimized to reduce an induced electromotive force to minimize production of noises so that correct detection can be accomplished. A grounding line is interposed for each arbitrary number of element lines on a surface of the inner tube, and the element lines are individually connected to output electrodes of an infrared rays sensor of the multi-element type while the individual grounding lines are connected to a common grounding electrode of the infrared rays sensor.

Abstract: Device to implement the method according to claim 1, wherein it is constituted of a vessel (2) provided with an intake tube (4) and an evacuation tube (8) for the gaseous atmosphere and whose inside forms the closed sampling space, is subdivided into a large number of small elementary intercommunicating volumes so as to enable the taken gaseous sample to be homogenized, as well as to allow for the diffusion and the spatially homogeneous trapping of all the solid daughter products thus constituting a homogeneous emitting source for the spectrometry chain which examines this source from outside.

Abstract: A radiation image read-out apparatus comprises a sheet holding device for holding a stimulable phosphor sheet on a cylindrical surface, and a spinner having a deflection mirror for reflecting stimulating rays coming from a semi-transparent mirror to the stimulable phosphor sheet, and a condensing lens which converges the reflected stimulating rays on the stimulable phosphor sheet and which has equal focal lengths with respect to stimulating rays and light emitted by the stimulable phosphor sheet. The deflection mirror and the condensing lens rotate together to scan the stimulating rays on the stimulable phosphor sheet in a main scanning direction, which sheet is moved in a sub-scanning direction. A detection lens converges the emitted light, which has passed through the condensing lens and comes from the semi-transparent mirror.

Abstract: A detecting or monitoring device for laser radiation is able to oeprate at room temperature and employs a thin film of semi-conductor material of non-centrosymmetric lattice structure having a substantial crystallographic texture; thin film may suitably be tellurium in a film thickness of 1 to 100 .mu.m, supported on a substrate of single crystal silicon.

Abstract: Magnesium oxide sensing material is pretreated and charged by UV radiation o identify impingement thereon of radiation from a near infrared laser source by detection of blue emissions which persist for an unusually long period of time, avoiding frequent respotting and recharging. When heated to thermoluminescence peaks above room temperature by irradiation from a far infrared laser source, the magnesium oxide exhibits green luminescence enabling wavelength discrimination between detection of near and far infrared laser sources. Such pretreated magnesium oxide also produces green emissions when irradiated by UV laser sources, to distinguish between detection of the UV laser sources and the far infrared laser sources by discrimination between different fading behaviors of the green emissions.

Abstract: A photon-counting type streak camera device measures by an integration operation the probability distribution of production timing of phenomenon light such as fluorescence light which a specimen produces upon reception of repeatedly generated pulse exciting light. A phenomenon streak camera system time-measures the phenomenon light, and a reference streak camera system time-measures reference light being synchronous with the exciting light. An arithmetic unit calculates the difference between outputs of the phenomenon and reference streak camera systems, so that the streak camera device can be prevented from being effected by a jitter or drift caused by a power change of a pulse light source.

Abstract: The subject of the present invention consists of a method and an apparatus for measurement of the fluorescence relaxation period of the radiation of a fluorescent substance whose fluorescence relaxation period is a function of at least one physical parameter. The fluorescence radiation is fed back to the output radiation in a regulating circuit, whose regulating parameter is a parameter for the physical parameter. This is accomplished by advancing the fluorescence radiation to a photoelectric receiver whose output signals are supplied to a voltage controlled oscillator following phase-sensitive rectification and integration. The fluorescence radiation is alternately phase-sensitively rectified only during the relaxation phase. The total durations of the different rectification periods in the two directions are identical. The alternatingly rectified signals are integrated.

Abstract: High resolution scintillation counters comprise a flat-faced photomultiplier tube 10 optically coupled to a long scintillator rod 30 having reduced internal light reflectance 45 and a medium 55 between the photomultiplier tube and the scintillator, said medium having both an index of refraction less than that of the scintillator and the capacity to attenuate light traveling from the scintillator to the photomultiplier on the basis of the light's point of origin within the scintillator. In preferred embodiments, the medium comprises air. The scintillation counters disclosed are useful in the detection of electromagnetic radiation, especially gamma rays.