A pilot study was performed in which hair samples were collected from 14 persons including 7 cigarette smokers (CS), 4 male, 3 female and 7 nonsmokers (NS), 4 male, 3 female. These subjects had been environmentally exposed to different concentrations of bedroom radon-222 (CS, 0.61 Â 0.8 kBq/m3; NS, 1.1 Â 1.6 kBqIm3). The hair samples were washed, labeled with a (race dose of Po-2081Po-209 (6 mBq), digested, and the polonium isotopes (208,209 and 210) were auto-plated onto polished silver disks. Polonium-210 activity was detected in all hair samples (CS, 3.9 * 3.7 mBq/g; NS, 4.1 2 4.7 mBqIg). Experiments indicated that Polonium-210 entered the hair through an internal pathway.
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