Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1980-05-23
1981-09-15
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
313 93, 313192, 313307, G01T 118
Patent
active
042899672
ABSTRACT:
A cylindrical, multiple-anode proportional counter is provided for counting of low-energy photons (<60 keV) at count rates of greater than 10.sup.5 counts/sec. A gas-filled proportional counter cylinder forming an outer cathode is provided with a central coaxially disposed inner cathode and a plurality of anode wires disposed in a cylindrical array in coaxial alignment with and between the inner and outer cathodes to form a virtual cylindrical anode coaxial with the inner and outer cathodes. The virtual cylindrical anode configuration improves the electron drift velocity by providing a more uniform field strength throughout the counter gas volume, thus decreasing the electron collection time following the detection of an ionizing event. This avoids pulse pile-up and coincidence losses at these high count rates. Conventional RC position encoding detection circuitry may be employed to extract the spatial information from the counter anodes.
REFERENCES:
patent: 3230372 (1966-01-01), Spacklen
patent: 3935464 (1976-01-01), Zingaro
patent: 4197462 (1980-04-01), Kopp
Hanson James A.
Kopp Manfred K.
Besha Richard G.
Breeden David E.
Hamel Stephen D.
The United States of America as represented by the United States
Willis Davis L.
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