Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1988-09-12
1990-01-09
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
25037015, G01T 124
Patent
active
048930164
ABSTRACT:
A semiconductor radiation detector is equipped with a semiconductor detection device such as silicon or germanium and is used in qualitative and quantitative analysis of X-rays or gamma-rays while the detection device is cooled with a refrigerator that makes use of the adiabatic expansion of air or nitrogen gas being released from an adiabatic expansion valve. In accordance with the present invention, the periphery of the gas outlet of the adiabatic expansion valve at the tip of the refrigerator is covered with a gas-permeable fibrous or screen-like material or with a laminate of two or more perforated plates. This construction ensures a passage of gas flow and yet reduces the air vibration that would otherwise occur when the gas is released from the adiabatic expansion valve. The detector of the present invention provides an energy resolution that is just comparable to the value attained when the detector is cooled directly with liquid nitrogen.
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Alberti et al., "A New Gas--Cooled Ge(I) and Si(Li) High Resolution Miniprobe", Nuclear Instruments and Methods 158, (1979), North--Holland Publishing Co., pp. 425-428.
Hanig Richard
Howell Janice A.
Japan Atomic Energy Research Institute
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