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Time-dependent 222Rn samples loss from small samples.

Authors
Bates-RC
Source
Health Phys 1980 Nov; 39:799-801
NIOSHTIC No.
10008478
Abstract
A research plan was prepared to measure the effect of moisture on the 222rn emanation coefficient in small uranium ore samples. One version of the plan called for the sealed can to be counted after a long storage and then opened to let the free radon escape. However, a question arose about the information on many emanation coefficient measurements ( for example, ha36, ki32, sh70, st57, and wa51). Reported values for 219rn, 220rn, and 222rn generally differ by less than a factor of 10, which is considerably less than expected from linear diffusion theory (1, 3.7, 290, for 219rn, 220rn, and 222rn, respectively) (ta78). This small difference suggests that radon escape is very rapid, and hence the steady-state flux might be reached within tens of seconds. None of the papers, however, specifically address the question; therefore, the Bureau of Mines performed the analytical study reported in this note.
CODEN
HLTPAO
Publication Date
19801101
Document Type
OP; Journal Article
Fiscal Year
1981
NTIS Accession No.
NTIS Price
Identifying No.
OP 57-80
ISSN
0017-9078
Source Name
Health Physics
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