Determination of Rn-222 absorption properties of polycarbonate foils by liquid scintillation counting. Application to Rn-222 measurements

作者：Mitev K^*; Cassette P; Georgiev S; Dimitrova I; Sabot B; Boshkova T; Tartes I; Pressyanov D

来源：Applied Radiation and Isotopes, 2016, 109: 270-275.

DOI：10.1016/j.apradiso.2015.11.047

• Rn-222
• LSC
• TDCR
• Polycarbonate foil

This work demonstrates that a Liquid Scintillation Counting (LSC) technique using a Triple to Double Coincidence Ratio counter with extending dead-time is very appropriate for the accurate measurement of Rn-222 activity absorbed in thin polycarbonate foils. It is demonstrated that using a toluene-based LS cocktail, which dissolves polycarbonates, the Rn-222 activity absorbed in thin Makrofol N foil can be determined with a relative standard uncertainty of about 0.7%. A LSC-based application of the methodology for determination of the diffusion length of Rn-222 in thin polycarbonate foils is proposed and the diffusion length of Rn-222 in Makrofol N (38.9 +/- 1.3 gm) and the partition coefficient of Rn-222 in Makrofol N from air (112 +/- 12, at 20 degrees C) and from water (272 +/- 17, at 21 degrees C) are determined. Calibration of commercial LS spectrometers for Rn-222 measurements by LSC of thin polycarbonate foils is performed and the minimum detectable activities by this technique are estimated.

• 出版日期2016-3
• 单位中国地震局