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이모성,구현미 청주대학교 산업과학연구소 2004 産業科學硏究 Vol.21 No.2
Gross beta analyses are an excellent screening technique to detect radioactivity in any environmental media. These analyses look at the activity in a sample from both naturally-occuring and man-made radionuclides. Filters collected air-borne dust at Cheongju monitoring station during a year, 2003. The filters were screened for gross beta radioactivity using thin-window gas flow proportional counting systems after waiting about 5 and 48 hours for naturally-occurring daughter products of radon to decay. We found that the count rates measured after 5 hours are proportional to them measured after 48 hours and the radio-nuclides in air borne dust are ^(234)Th and ^(212)Pb.