The use of glass as a substrate for radon active product monitoring was previous1 suggested by Lively and ~e~(l) and further discussed by Samuelsson ( 27 as a retrospective radon monitor. The deposition of active products on glass or other stable surfaces is partly accomplished by transport by aerosols and partly by unattached ions and atoms. The surface pb2l0 activity has two components, the aerosol transported which can be wiped off, and the unattached atomic component which is embedded in the substrate. The unwashable part is believed to be associated with the carcinogenic component first postulated by Chamberlain and D~SOTI(~).DISCUSSION Lively and Ney (1987) published a report of work in which they measured the surface alpha activity on material from a cave where the average radon level was 230 pCi/l and a basement window from a room with a minimum radon level of 7 pCi/L. The surface activity was also compared with the quantity of 210~o recovered chemically by removal of th
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