Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1994-09-08
1996-09-03
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
250352, G01T 124, G12B 1502
Patent
active
055526098
ABSTRACT:
A miniatured semiconductor radioactive ray detector which has an energy resolution substantially equivalent to that of a conventional semiconductor radioactive ray detector without use of liquid nitrogen and is simple as well as readily portable is disclosed. A Stirling type electric refrigerator is provided for cooling the semiconductor radioactive ray detecting element to the temperature near to a cryogenic temperature of liquid nitrogen. The first stage amplification circuit of the signal preamplifier for amplifying the detected signal relating to the radioactive ray and the signal line as well as circuit wiring are covered and molded by a fibrous material having gas permeability and electric insulation properties so as to reduce microphonics which are likely to be generated due to the electric refrigerator. The compression pump associated with the electric refrigerator is fixed to the support base by way of the vibration absorbing material which absorbs the vibration caused by the compression pump. A circuit for reducing the microphonics is provided at the input stage of the main signal amplifier.
REFERENCES:
patent: 5157255 (1992-10-01), Kornrumpf et al.
"Operational Characteristics Of A High Purity Germanium Photon Spectrometer Cooled By A Closed-Cycle Cryogenic Refrigerator," Marler, J. M., et al. (Space Technology Products, G.E. Electric Co., Phila. Pa), Nuclear Science, vol. NS-20, No. 1, Feb. 1973, pp. 522-527.
"Performance Of A High-Purity Ge Gamma-Ray Spectrometer System Using A Closed-Cycle Cryogenic Refrigerator," Sakai, Eiji, et al. (Japan Atomic Energy Research Inst., Tokaimura, Japan), IEEE Transactions on Nuclear Science, vol. NS-29, No. 1, Feb. 1982, pp. 760-763.
"Performance of a Gamma-Ray and X-Ray Spectrometer Utilizing Germanium and Si(Li) Detectors Cooled by a Closed-Cycle Cryogenic Mechanical Refrigerator," Stone, R. E., et al. (EG&G ORTEC, Oak Ridge, TN), IEEE Transactions on Nuclear Science, vol. 33, No. 1, Feb. 1986. pp. 299-302.
Hannaher Constantine
Japan Atomic Energy Research Institure
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