[en] After a brief recall of signal formation principle in a detector and of its different operation modes, the high Z materials as CdTe, HgI₂, GaAs ,Ge and Si are presented, followed by the new 'thin layer' semiconductors

[en] An activated concrete sample was counted at different source to detector distances with CdZnTe and HPGe detectors. The experimental count rates for different radionuclides were converted to dose rate using Monte Carlo code and compared with the Measured dose rates obtained using digital survey meter. The results agreed well for both the detectors. This indicates that CdZnTe detector having a better portability but poorer resolution than HPGe detector can be effectively used for online monitoring of radioactivity as well as dose rate calculations. (author)

[en] Three semiconductors are nowadays available for nuclear detection (germanium, mercury iodide, cadmium telluride). Their methods of elaboration are briefly described and, as a conclusion, a very close at-hand development of cadmium telluride is foreseen

[en] Radiation detectors are those detecting radiation by utilizing the ionization, scintillation and physical or chemical change when the radiation is injected into gas, liquid or solid. First, the development of a radiation detector is carried out to satisfy the need of a researcher, but later, the developed detector is applied to other fields and opens up a new field of science. An air ionization chamber, a ZnS scintillator and dry plates have been used around 1900, and the history of the development of radiation detectors is described. In this report, the recent trends of scintillation detectors such as sodium iodide and bismuth germanate, semiconductor detectors of silicon, germanium, gallium arsenide, cadmium telluride and mercuric iodide, multi-wire detectors, gas scintillation proportional counters and liquid detectors are reviewed. The performance of the detectors is deeply related to the purity of the media to be detected and the progress of the techniques to produce high purity matters. The production of high purity matters requires long time and huge investment, but usually, radiation detectors do not have the market to reward for the investment. Therefore, they must wait for the progress of general material production. The example is the semiconductor detectors of silicon and germanium. (Kako, I.)

No abstract available

[en] This document describes the basic detector performance for the CCI1 device, which consists of the Si2 and Ge2 detector components

[en] A historical review is given of the development of semiconductor detectors, especially silicon and germanium, for use in nuclear physics applications. A brief discussion of the physics of detectors considers junctions and surface problems. A brief summary of the required material characteristics is given and the severity of the material requirements is stressed. The accompanying development of low-noise electronics and signal processing techniques is noted

No abstract available

[en] Neutron detection in hostile environments such as nuclear reactors has been performed using a new kind of semiconductor detector. So far, crystalline semiconductor detectors are not used in nuclear reactor instrumentation because of their sensitivity to radiation damage. For doses in excess of a few tens of kilo rads, radiation induced lattice defects produce a strong loss in the standard semiconductor detector performances. In the last few years, new semiconductor materials having amorphous or polycrystalline structures such as silicon, silicon carbide or CVD diamond, became available. These semiconductors, produced by Chemical Vapor Deposition, come in the form of thin layers being typically a few tens of micron thick. Their crystalline structure is particularly resistant to radiation damage up to a few Mrads but prevent the material use in spectrometry measurements. Nevertheless, these detectors, working in a counting mode, are suitable for the detection of alpha particles produced by the neutron capture reaction with boron. Such thin film detectors have a very poor sensitivity to γ-ray background. Furthermore, they are easier and cheaper to implement than current neutron gas counters. Preliminary results obtained with diamond and amorphous silicon diodes exposed to α particles are presented. (authors). 7 figs., 3 tabs., 11 refs

[en] Investigations were carried out into the practicality of using cadmium telluride or mercuric iodide detectors as an alternative to sodium iodide detectors for the purpose of plutonium-in-wound monitoring. The theoretical advantages, and the practical difficulties found in using such detectors, are described. (author)