No abstract available

[en] A scintillation detector that is robust enough for industrial applications has at least two scintillation crystals supported and cushioned by a resilient support material, conveniently silicone rubber

No abstract available

[en] The scintillation crystal is suitable for use in computer tomography. It is in the form of a wedge, at whose wide end there is a photo-electric diode. The X-rays or γ-radiation impinges on one of the wedge surfaces. The other wedge surfaces, except the wide end, are provided with light scattering coatings, so that all the light produced is directed to the photo-electric diode. (DG)

[en] Design and performance of the Plastic Ball detector are described. The Plastic Ball identifies light charged particles with a solid angle of 96% of 4π. 2 figures

No abstract available

[en] A solid scintillation detector is described with automatic sample handling means, which is not dependent upon the sample volume, minimizes contamination problems with the crystal detector, has a single sample measurement capability, and is compact and relatively portable. (E.C.B.)

[en] This invention concerns emission radiography cameras in general and, in particular, the collimator and scintillator structures of gamma ray cameras. The collimator/scintillator structure is characterized by an extremely high resolution. This resolution is limited only by the collimator material which must be thick enough to avoid any cross-checking between adjacent cells but nevertheless sufficiently thin for its cross-section area not to be significant in relation to the area of the channels formed by the cells of the collimation grating. In accordance with the invention, the scintillator material takes up the end of the collimation grating which is at the opposite end of the source of gamma photons. The scintillator is generally a material with an appropriate refraction index such as europium doped barium fluorochloride (BaFCl : Eu) in suspension in a substance with an appropriate refraction index

No abstract available

[en] The limitations of gross-count logging systems in mixed uranium-thorium environments have prompted the development and production of gamma ray spectrometric logging equipment (particularly portable units for use in rugged terrain) by a number of manufacturers. Sodium iodide and cesium iodide scintillation detectors are still used almost exclusively as the radiation sensors but some advances have been made in detector technology with bismuth germanate being one of the most promising new detector materials. Work on improving methods of stabilizing down-hole scintillation detectors against the effects of temperature change on the gamma-ray energy spectrum has indicated that artificially induced scintillations from light emitting diodes or alpha particle sources (e.g. Am₂₄₁) implanted in the crystal are subject to error when the probe assembly is undergoing a temperature transition. Low energy gamma-ray sources, such as Ba₁₃₃ (356 keV) are used in most spectral loggers today, although it has limitations. A more promising approach to correct for spectral drift is the application of spectral fitting techniques to the recorded data. Considerable progress has been made in the development of model borehole calibration facilities to derive the calibration factors necessary for spectral logging. The energy dependence of borehole correction factors has also been investigated. Microcomputer technology has now reached the stage where on-line data processing is practical. Portable logging equipment is commercially available with on-line display of quantitative uranium determinations implemented by inverse filtering as well as recording raw data on a digital cartridge tape