Radon Progeny Exposure Measurement Using Lead-210.
NIOSH 1972 Nov:110 pages
The feasibility of using lead-210 (14255040) as a quantative indicator of exposure to radiation in uranium mine atmospheres is studied. The nature of radon-222 is described, along with the principal inhalation exposure situation in a mine and the most widely used method for measuring the exposure. Four mathematical models predicting lead-210 ingrowth in a tunnel atmosphere from the decay of radon progeny in the air are described, and theoretical results are summarized. An extraction technique for the sample preparation for liquid scintillation counting of lead-210 is described, and an interlaboratory comparison check of dithizone extraction techniques applied to environmental samples is summarized. Field studies of the extent of background contributions to lead-210 samples, along with experimental studies of lead-210 ingrowth patterns, are summarized. The author concludes that a technique to enable the efficient extraction of lead-210 within the quantitative detection limit of the liquid scintillation counting system was developed. The measurement results indicate that the magnitude of the background contribution to the samples are the dominant source of lead-210. However, the lead-210 bioassay technique does not identify the extent of background contributions to the miner's body burden of lead-210.
NIOSH-Contract; Contract-099-71-0012; Radioactive-isotopes; Radiation-measurement; Analytical-methods; Radiation-exposure; Uranium-miners;
New Mexico Environmental Improvement Agency, Radiation Protection Section, Santa Fe, New Mexico, NIOSH Contract No.