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Wang, J. ; Meisenberg, O. ; Chen, Y.H.* ; Karg, E.W. ; Tschiersch, J.

Filtration approach to mitigate indoor thoron progeny concentration.

Nukleonika 55, 445-450 (2010)
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This study investigates filtration of air as potential mitigation method of thoron progeny exposure. The experiments were conducted in a model room (volume 7.1 m(3)) which was equipped with a pump and an HEPA (high efficiency particulate air) filter. Filtration at a rate of 0.2, 0.4, 0.5 and 0.8 h(-1) during 88 h proved an effective practice in reducing the total indoor thoron decay product concentration. The results indicate that 0.4-0.8 h(-1) filtration rate had almost the same filtration efficiency in decreasing the total thoron EEC (equilibrium equivalent concentration) by 97% while 80% of total thoron EEC were reduced by 0.2 h(-1) filtration rate; meanwhile, the unattached thoron EEC rose significantly by 190, 270, 290%, respectively under 0.4-0.8 h(-1) filtration rate, whereas 0.2 h-1 filtration rate increased unattached thoron EEC by 40%. The aerosol number size distribution variation reveals that filtration operation removes smaller particles faster or earlier than the larger ones. The annual effective dose calculated was reduced by 91-92% at a filtration rate of 0.4-0.8 h-1 while 75% reduced at 0.2 h(-1) filtration rate after 88 h filtration process.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords filtration; thoron progeny; potential alpha energy concentration (PAEC); equilibrium equivalent concentration (EEC); mitigation
ISSN (print) / ISBN 0029-5922
e-ISSN 1508-5791
Journal Nukleonika
Quellenangaben Volume: 55, Issue: 4, Pages: 445-450 Article Number: , Supplement: ,
Publisher Institute of Nuclear Chemistry and Technology (INCT)
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Radiation Protection (ISS)
Institute of Ecological Chemistry (IOEC)
Cooperation Group Comprehensive Molecular Analytics (CMA)