Alpha particle monitor

Details Alpha particle monitor Alpha particle monitor

1979-02-02

1981-04-14

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250380, G01T 118

Patent

active

042622034

ABSTRACT:
An alpha particle monitor is disclosed which includes a flow-through linear ionization chamber with means to pass therethrough gas-borne radioactive matter exhibiting alpha decay, such as, radon gas, air-borne plutonium or uranium dust, etc., and an amplifier sensitive to charges on the order of 10.sup.-14 coulombs associated with an alpha emission event. In a preferred form, the amplifier includes a solid state operational amplifier having a stray feedback capacitance sufficiently low to provide, in response to an alpha decay event, an output pulse with a measurable voltage amplitude, e.g., 0.1-1.0 volts, and a feedback resistance sufficiently high to provide the amplifier with a time constant such that the output pulse produced in response to an alpha emission event has a width sufficient to facilitate detection in the presence of noise.
Circuitry is also included for measuring emissions which have energies significantly lower than alpha particles, such as beta or gamma radiation, and/or energies of lower specific ionization than alpha particles. The circuitry can measure such low energy and/or low specific ionization emissions either alone or simultaneously with the measurement of alpha emissions.

REFERENCES:
patent: 3093738 (1963-06-01), Mann et al.
patent: 3204099 (1965-08-01), Ludlum
patent: 3426232 (1969-02-01), Molitor
patent: 3959653 (1976-05-01), Lee et al.

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