caa a22 4500 445812745 CHVBK 20180317145217.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00411-010-0338-5 doi (NATIONALLICENCE)springer-10.1007/s00411-010-0338-5 Characteristics of thoron and thoron progeny in Canadian homes [Elektronische Daten] [Jing Chen, Deborah Moir, Atsuyuki Sorimachi, Shinji Tokonami] Naturally occurring isotopes of radon in indoor air are identified as the second leading cause of lung cancer after tobacco smoking. Radon-222 (radon gas) and radon-220 (thoron gas) are the most common isotopes of radon. While the radon equilibrium factor is well established, the equilibrium factor between thoron progeny and thoron gas is still not well known. Thoron gas and progeny concentrations were determined in the lowest floors of 138 Canadian homes simultaneously. While thoron gas was only detectable in about 52% of the homes, thoron progeny concentrations were measured in every home surveyed. Thoron concentrations, thoron progeny concentrations, and the equilibrium factors varied widely and were log-normally distributed. With a 3months simultaneous measurement of thoron and thoron progeny concentrations, the equilibrium factor was determined to be 0.024 with a geometric standard deviation of 2.7. Her Majesty the Queen in Right of Canada, 2010 Chen Jing Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON, Canada aut Moir Deborah Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON, Canada aut Sorimachi Atsuyuki National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, 263-8555, Chiba, Japan aut Tokonami Shinji National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, 263-8555, Chiba, Japan aut Radiation and Environmental Biophysics Springer-Verlag 50/1(2011-03-01), 85-89 0301-634X 50:1<85 2011 50 411 https://doi.org/10.1007/s00411-010-0338-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00411-010-0338-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Jing Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON, Canada aut NATIONALLICENCE 700 1- Moir Deborah Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON, Canada aut NATIONALLICENCE 700 1- Sorimachi Atsuyuki National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, 263-8555, Chiba, Japan aut NATIONALLICENCE 700 1- Tokonami Shinji National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, 263-8555, Chiba, Japan aut NATIONALLICENCE 773 0- Radiation and Environmental Biophysics Springer-Verlag 50/1(2011-03-01), 85-89 0301-634X 50:1<85 2011 50 411 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer