Abstract：
:This work describes a technique for the measurement of 222Rn by absorption in polycarbonate (PC) powder and liquid scintillation counting (LSC). The work is an improvement of the recently proposed method for 222Rn measurements by LSC of exposed PC grains. It is demonstrated that the use of PC powder as a 222Rn sampler improves 13.6 times the sampling efficiency and leads to 6.5 times smaller minimmal detectable activity concentrations (MDAC) compared with the PC grains used so far. For a 40-h exposure of 7.4-g PC powder to 222Rn in air, the MDAC with a RackBeta 1219 LS counter is 62 Bq m(-3) (assuming a 8-h sample counting time and 24-h background time). For the same conditions the estimated 222Rn MDAC with a Quantulus 1220 LS counter is 20 Bq m(-3). The proposed technique is suitable for radon in air and radon in soil-gas measurements.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Mitev K,Georgiev S,Pressyanov D,Dimitrova I,Zhivkova V,Boshkova Tdoi
10.1093/rpd/ncu075subject
Has Abstractpub_date
2014-07-01 00:00:00pages
188-91issue
1-3eissn
0144-8420issn
1742-3406pii
ncu075journal_volume
160pub_type
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