Method of continuously determining radiation working level expos

Details Method of continuously determining radiation working level expos Method of continuously determining radiation working level expos

1978-06-29

1980-01-22

Anderson, Bruce C.

Radiant energy

Fluent material containment, support or transfer means

With irradiating source or radiating fluent material

250364, G01T 116

Patent

active

041851994

ABSTRACT:
A method for determining the working level exposure to airborne radioactive material by measuring the beta count per unit time. The gas radon-222 gives off three short lived daughter products commonly designated as RaA, RaB and RaC. Air, within the environment whose level is to be measured, is pumped through an opened face filter and screen assembly forming part of a detector holder mount. Radioactive particulate matter, consisting of radon-222 daughter products is collected on the filter. Thereafter, beta particles generated by the radioactive decay of the daughter products impinge upon a Geiger-Mueller tube which detects the beta particle activity per unit time. A pulse integrating system counts the detected beta particles. Based on prior experimentally calibrated results, the total count of beta particles is converted to a working level exposure.

REFERENCES:
patent: 2892091 (1959-06-01), Sawle
patent: 3555278 (1971-01-01), Schroeder
patent: 3968371 (1976-07-01), Greendale
patent: 3988587 (1976-10-01), Shreve et al.
patent: 4053775 (1977-10-01), Franklin et al.
patent: 4055762 (1977-10-01), Durkin

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