Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1995-06-26
1996-09-03
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
250352, 250347, G01T 100
Patent
active
055526080
ABSTRACT:
A radiation detector having an evacuated envelope, a radiation detector on a cold finger support in the evacuated space, a closed cycle gas cooling system to cool the cold finger to provide cryogenic operation of the radiation detector, and a getter in the evacuated space to maintain an evacuated condition. The evacuated envelope includes a radiation window. The radiation detector is preferably an X-ray detector employed in an energy dispersive spectrometry system. The evacuated space is preferably held at a pressure of less than about 1 mTorr to achieve molecular flow of remaining gas molecules, minimizing parasitic heat input. The closed cycle gas cooling system employs compressed refrigerant, which is precooled in a counterflow heat exchanger and allowed to expand in proximity to the cold finger, thus absorbing heat and maintaining cryogenic temperatures. A getter material, preferably activated carbon, is provided to absorb gasses and maintain the low pressure during operation. A vibration effect attenuation system is provided to reduce effect of cooler induced reduction in detector resolution.
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Material Safety Data Sheet, Nov. 1988, L-4888-B no page number.
The Book of the CCIR Radiopaging Code No. 1, POCSAG, pp. 2, 4, 8-12 and 38-40 no dated.
Barbara Richard
Blionas Costas
Gallagher Brian W.
Nicolosi Joseph A.
Barschall Anne E.
Nguyen Kiet T.
Philips Electronics North America Corporation
Willis Davis L.
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