Title: Method of continuously determining radiation working level exposure

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.

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Inventors: Droullard, Robert F. (Lakewood, CO, US)
Holub, Robert F. (Lakewood, CO, US)

Application Number: 920513
Filing Date: 1978-06-29
Publication_date: 1980-01-22
Assignee: The United States of America as represented by the Secretary of the (Washington, DC)
Primary Class(es): 250/435 250/364, 250/DIG2
Other Classes:
US Patent Ref:

2892091	Jun, 1959	Sawle	250/364.
3555278	Jan, 1971	Schroeder	250/435.
3968371	Jul, 1976	Greendale	250/435.
3988587	Oct, 1976	Shreve et al.	250/364.
4053775	Oct, 1977	Franklin et al.	250/435.
4055762	Oct, 1977	Durkin	250/364.

Other Refs:
Primary Examiner: Anderson, Bruce C.
Assistant Examiner:
Attorney: Brown; William S., Gardiner; Donald A.