Surface radiation detector

Details Surface radiation detector Surface radiation detector

1995-01-27

1996-07-23

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250374, G01T 1185

Patent

active

055392083

ABSTRACT:
A surface radiation detector for sensing low energy ionizing radiation on the surface of an object includes a open window gas proportional counter provided with a compressible skirt surrounding the window in a detection chamber. The compressible skirt is preferably of open cell plastic foam, but may be made from a gas impermeable sheet formed in the shape of an accordion bellows. An open screen of electrically conductive material, attached to said skirt and covering the window, may be placed in direct contact with the surface of an object to be tested. Counter gas flows at a rate into the chamber sufficient to maintain a positive pressure in the chamber relative to the ambient atmosphere. A momentarily actuated valve supplies additional counter gas at a flow rate sufficient to fill said chamber within a short period of time. A self-collapsing bladder is connected to said chamber for temporarily storing the counter gas when the skirt is compressed as the instrument is pressed against the tested surface and for releasing the gas when the instrument is removed from the surface.

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