Abstract
It has been reported that thoron levels in China are above the world average and maytherefore make a significant contribution to the natural background radiation dose. Wetherefore conducted a pilot study of concentrations of both thoron and radon progeny duringthe spring of 2006 in the Beijing area, China. A new type of portable 24 h integratingmonitor with a CR-39 detector was used during the survey. Seventy dwellings and eightoutdoor sites were measured during the survey. For country houses built of red bricks andslurry, the average equilibrium equivalent concentrations (EEC) of thoron and radon were1.02 ± 0.48 and 16.41 ± 9.02 Bq m−3, respectively, whereas for city dwellings built of cement blocks and floor slabs, the results were0.48 ± 0.47 and 11.50 ± 6.99 Bq m−3 for thoron and radon, respectively. For outdoor air, concentrations of thoron and radon progeny were0.29 ± 0.28 and 7.05 ± 2.68 Bq m−3, respectively. Radiation exposures from thoron and radon progeny were alsoevaluated; the ratio of dose contribution from thoron progeny to that of radonprogeny was evaluated to be 28% and 17% in country houses and city dwellings,respectively.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
