Radiant energy – Invisible radiant energy responsive electric signalling – Including ionization means
Patent
1984-12-17
1986-11-11
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Including ionization means
G01T 1185
Patent
active
046224670
ABSTRACT:
A system for mapping radioactive specimens comprises an avalanche counter, an encoder, pre-amplifier circuits, sample and hold circuits and a programmed computer. The parallel plate counter utilizes avalanche event counting over a large area with the ability to locate radioactive sources in two dimensions. When a beta ray, for example, enters a chamber, an ionization event occurs and the avalanche effect multiplies the event and results in charge collection on the anode surface for a limited period of time before the charge leaks away. The encoder comprises a symmetrical array of planar conductive surfaces separated from the anode by a dielectric material. The encoder couples charge currents, the amplitudes of which define the relative position of the ionization event. The amplitude of coupled current, delivered to pre-amplifiers, defines the location of the event.
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Parkhomchuck et al., "A Spark Counter with Large Area," Nuc. Inst. & Methods, 93, No. 2 (1971), 269-270.
Britten Roy J.
Davidson Eric H.
California Institute of Technology
Howell Janice A.
Tachner Leonard
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