Open grid pulsed ion chamber operating in the linear ion collect

Details Open grid pulsed ion chamber operating in the linear ion collect Open grid pulsed ion chamber operating in the linear ion collect

1988-08-15

1989-08-22

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250387, 250388, H01J 4702

Patent

active

048598542

ABSTRACT:
A detector for airborne alpha radiation includes a ion pulse collecting chamber connected to a phase shifted, 100% negative feedback electrometer circuit. The ion pulse chamber includes a probe surrounded by an 80% open grid, with the spacing between the probe and the grid providing no greater than about 50 ms transit time before collection and having a capacitance of less than 1 pf. The field strength between the probe and the grid is less than 10 V/cm. The ion pulse chamber is contained within a vented cabinet. If it is desired to count only radon, a negative potential with respect to the grid may be applied to the cabinet to collect positively charged free ions. Alternatively, the cabinet wall can be made positive with respect to the grid to create a potential-well at or near the grid to provide an enhanced daughter detection mode. If the cabinet wall and the grid are the same potential, both radon and daughter alpha radiation are detected.

REFERENCES:
patent: 2499830 (1950-03-01), Molloy
patent: 3408571 (1968-10-01), Wilson
patent: 3603831 (1971-09-01), Kimmel
patent: 4262203 (1981-04-01), Overhoff
patent: 4288694 (1981-09-01), Ahrons
patent: 4755682 (1988-07-01), Burgess
Roland A. Jalbert, "A Monitor for Tritium in Air Containing Other Beta Emitters," Proceedings of 23rd Conference on Remote Systems Technology, San Francisco, California, (Nov. 17-20, 1975), pp. 89-93.
Greinacher, H., "Registering of .alpha.- and H-Rays According to the New Electrical Counting Method," Z. Physik, 44, 319-325 (1927) [as reported in 21 Chemical Abstracts 3544].
Wilkinson, D. H., Ionization Chambers and Counters, Cambridge, University Press, 1950, pp. 104-113.
Price, William J., Nuclear Radiation Detection, New York, McGraw-Hill Book Company, Inc., 1958, pp. 67, 75, 101-106 and 358-359.

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