title: [Background of low-level gamma-ray spectrometer due to the atmospheric 220Rn and 222Rn].
abstract: In connection with low-level gamma-ray counting of natural samples, background due to 220Rn- and 222Rn-daughters was monitored. The results obtained for 4 months showed that the background gamma-ray from 222Rn-daughters was more variable than that of 220Rn-daughters. An efficient air-conditioning was helpful to keep the background stable. It was practically equivalent to the use of N2-gas. Radiometric data for dust samples filtered from the laboratory air suggested that Rn-daughters tended to be removed by air-conditioning.
authors.affiliation: Earthquake Research Institute, University of Tokyo.
authors.forename: H
authors.initials: H
authors.lastname: Takahashi
authors.forename: Y
authors.initials: Y
authors.lastname: Koizumi
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: J
authors.initials: J
authors.lastname: Sato
mesh_terms: D000393:Air Pollutants; D000396:Air Pollutants, Radioactive; D001417:Background Radiation; D001729:Bismuth; D007564:Japan; D007854:Lead; D011059:Polonium; D011839:Radiation, Ionizing; D011886:Radon; D017687:Radon Daughters
chemical_list: D000393:Air Pollutants; D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D007854:Lead; D011059:Polonium; D011886:Radon; D001729:Bismuth