Alternating current long range alpha particle detector

Details Alternating current long range alpha particle detector Alternating current long range alpha particle detector

1991-11-27

1993-02-16

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250374, 250380, G01T 1185

Patent

active

051873702

ABSTRACT:
An alpha particle detector, utilizing alternating currents, whcih is capable of detecting alpha particles from distinct sources. The use of alternating currents allows use of simpler ac circuits which, in turn, are not susceptible to dc error components. It also allows the benefit of gas gain, if desired. In the invention, a voltage source creates an electric field between two conductive grids, and between the grids and a conductive enclosure. Air containing air ions created by collision with alpha particles is drawn into the enclosure and detected. In some embodiments, the air flow into the enclosure is interrupted, creating an alternating flow of ions. In another embodiment, a modulated voltage is applied to the grid, also modulating the detection of ions.

REFERENCES:
patent: 2502617 (1950-04-01), Fearon
patent: 5003176 (1991-03-01), Tanaka et al.

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