title: Measurement of thoron exhalation rates from building materials.
abstract: Thoron (220Rn) exhalation from building materials has become increasingly recognized as a potential source for radiation exposure in dwellings. However, contrary to radon (220Rn), limited information on thoron exposure is available. The purpose of this study is to develop a test method for the determination of the thoron exhalation rate from building materials. The method is validated, and subsequently the thoron exhalation rates from 10 widely-applied concretes, gypsums, brick, limestone, and mortar are determined. The measured thoron exhalation rates of these materials range from 0.01 Bq m-2 s-1 to 0.43 Bq m-2 s-1, with relative standard uncertainties between 6% to 14%.
authors: *Nuclear Research and Consultancy Group (NRG), Utrechtseweg 310, NL-6800 ES Arnhem, The Netherlands; †Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.
authors: G
authors: G
authors: de With
authors: P
authors: P
authors: de Jong
authors: A
authors: A
authors: Röttger
mesh_terms: D002138:Calibration; D003252:Construction Materials / Q000032:analysis*; D057230:Limit of Detection; D016014:Linear Models; D011834:Radiation Monitoring / Q000295:instrumentation / Q000379:methods*; D011886:Radon / Q000032:analysis*; D015203:Reproducibility of Results; D035501:Uncertainty
chemical_list: D011886:Radon