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1. (WO1997011389) GAMMA RAY DETECTOR

Pub. No.:    WO/1997/011389    International Application No.:    PCT/US1996/015129
Publication Date: Mar 27, 1997 International Filing Date: Sep 20, 1996
IPC: G01T 1/185
H01J 47/02
Applicants: KOSTER, James, E.
WALTERS, Steven, G.
MACARTHUR, Ducan, W.
Inventors: WALTERS, Steven, G.
MACARTHUR, Ducan, W.
Title: GAMMA RAY DETECTOR
Abstract:
A gamma detector (10) comprises a sealed electrically conductive enclosure (11) defining a cavity filled with a gas, and with signal collection means (12) insulatively mounted in the cavity and positioned to substantially span the cavity so that gas ions generated in the cavity as a result of gamma ray interaction are electrostatically captured by the signal collection means (12) when an electric potential is applied between the electrically conductive enclosure (11) and the signal collection means (12). Indicator means (19) are attached to the signal collection means (12) for indicating an electrical current produced by collection of gas ions generated in the cavity by gamma rays in the cavity. A voltage source (18) is connected between the indicator means (19) and the electrically conductive enclosure (11) to provide the electrical potential for collection of the gas ions.