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- W16507683 abstract "The detection of the Pu/sup 239/ maximum permissible air concentration (MPC) of 2 x 10/sup -12/ mu c/cc is complicated by a varying background o3 natural alpha emitiers. The air concentration of radon and thoron, in particular, varies considerably with atmospheric conditions. Since one MPC of airborne Pu is only 4.44 x 10/sup -6/ dpm/cc, it is necessary to integrate the activity on a fixed filter to obtain adequate measurement sensitivity. Radon and thoron are also coliected on the filter, and at times may accumulate to several hundred times the required detection level for Pu/sup 239/. An instrument using coincidence counting techniques was developed to measure the Pu/sup 239/ air concentration levels. In the decay chain for radon, Ra C decays by beta emission to Ra C' which decays by alpha emission with a half life of 163 mu sec; and in the similar thoron chain, Th C decays by beta emission to Th C' which decays by alpha emission with a half life for 0.3 mu sec. Delayed coincidence-counting techniques are used to identify counts due to natural alpha particles, and these counts are subtracted from a total alpha count to provide a measurement of Pu/sup 239/ The developedmore » instrumert can detect continuous airborne Pu/sup 239/ concentrations of 2 x 10/sup -11/ mu c/cc in about 90 minutes and 2 x 10/sup -12/ mu c/cc in about 900 minutes. These detection levels can be obtained with background Ra--Th concentration levels of 2 x 10/sup -10/ mu c/cc. (auth)« less" @default.
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- W16507683 date "1962-05-14" @default.
- W16507683 modified "2023-09-27" @default.
- W16507683 title "AIR MONITOR AND PROTECTION--A COINCIDENCE-COUNT ALPHA PARTICULATE AIR MONITOR" @default.
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