title: Comparative analysis of radon, thoron and thoron progeny concentration measurements.
abstract: This study examined correlations between radon, thoron and thoron progeny concentrations based on surveys conducted in several different countries. For this purpose, passive detectors developed or modified by the National Institute of Radiological Sciences (NIRS) were used. Radon and thoron concentrations were measured using passive discriminative radon-thoron detectors. Thoron progeny measurements were conducted using the NIRS-modified detector, originally developed by Zhuo and Iida. Weak correlations were found between radon and thoron as well as between thoron and thoron progeny. The statistical evaluation showed that attention should be paid to the thoron equilibrium factor for calculation of thoron progeny concentrations based on thoron measurements. In addition, this evaluation indicated that radon, thoron and thoron progeny were independent parameters, so it would be difficult to estimate the concentration of one from those of the others.
authors.affiliation: Regulatory Science Research Program, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
authors.forename: Miroslaw
authors.initials: M
authors.lastname: Janik
authors.forename: Shinji
authors.initials: S
authors.lastname: Tokonami
authors.forename: Chutima
authors.initials: C
authors.lastname: Kranrod
authors.forename: Atsuyuki
authors.initials: A
authors.lastname: Sorimachi
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hosoda
authors.forename: James
authors.initials: J
authors.lastname: McLaughlin
authors.forename: Byung-Uck
authors.initials: BU
authors.lastname: Chang
authors.forename: Yong Jae
authors.initials: YJ
authors.lastname: Kim
mesh_terms: D016902:Air Pollution, Indoor / Q000032:analysis; D002138:Calibration; D004784:Environmental Monitoring / Q000379:methods / Q000592:standards*; D006798:Housing; D007391:International Cooperation; D018384:Oxidative Stress; D011834:Radiation Monitoring / Q000379:methods / Q000592:standards*; D011848:Radioactive Pollutants / Q000032:analysis*; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*; D015203:Reproducibility of Results; D012984:Software
chemical_list: D011848:Radioactive Pollutants; D017687:Radon Daughters; D011886:Radon
keywords: radon; thoron; thoron equilibrium factor; thoron progeny