Simultaneous determination method of radon-222 and radon-220 by a toluene extraction-liquid scintillation counter |
| |
Authors: | Y Murakami K Horiuchi |
| |
Institution: | (1) Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, No. 2 Fukasawa 1, Setagaya, 158 Tokyo, (Japan) |
| |
Abstract: | A new determination method for222Rn and220Rn in water sample was developed by extracting radon with toluene and applying the integral counting method with a liquid
scintillation counter. The essential characteristics of the methods are, (1) extraction of radon with toluene from water,
(2) finding absolute counts and making corrections for the quenching effect by the adoption of the integral counting method,
(3) the determination of222Rn and220Rn was performed by counting the activity of220Rn with its descendants and of ThB (212Pb) with its descendants in a radioactive equilibrium, respectively, (4) realizing high sensitivity by simultaneous counting
of α, β− particles emitted from the decay products formed in toluene. The lowest detection limit obtained by the present method was
5.0·10−13 Ci/l for222Rn and 6.8·10−8 Ci/l for220Rn in water. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|