Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1991-08-07
1993-03-09
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250380, 2503851, G01T 1185
Patent
active
051928680
ABSTRACT:
A proportional-type detector for the detection of low levels of radioactivity, such as alpha and beta particles generated by radioactive materials. In the preferred embodiment, this detector has a pancake-shaped cavity with a disk-shaped base and a cylindrical wall, with at least one anode member traversing the cavity. This anode member is maintained at an elevated potential so as to multiply and collect electrons formed within a counting gas within the cavity as a result of interaction between the radioactivity and a counter gas cavity. A perforated grid member, in one embodiment being a spiral coil, is substantially concentric with the anode member to provided a uniform electric field around the anode member. In the preferred embodiment, spacing between turns of the spiral grid is equal to or less than twice the radial distance between the anode member and the inside diameter of the grid. While an opening into the cavity can be covered with a window that is transparent to the radioactivity (the alpha and beta particles) for the retention of the counting gas, improved operation is obtained without a window for most applications.
REFERENCES:
patent: 2499830 (1950-03-01), Molloy
patent: 5025162 (1991-06-01), Charpak
patent: 5083027 (1992-01-01), Kuhn
patent: 5087820 (1992-02-01), Kearns et al.
Tennelec, "LB5500 5 Inch Automatic Low Background Alpha/Beta Counting System" brochure.
Tennelec, "LB4000 Multi-Detector Low Level Alpha/Beta Counting System", bulletin.
Buneman, O. et al., "Design of Grid Ionization Chambers", Canadian Journal of Research, vol. 27, Sec. A, pp. 191-206.
Dunn Drew A.
Fields Carolyn E.
Tennelec/Nucleus Inc.
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