Concentration Measurement of 85Kr Dissolved in the Solution with GM Counter
1980 Volume 29 Issue 9 Pages 422-426
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1980 Volume 29 Issue 9 Pages 422-426
When 85Kr gas is used as an internal radiation source for chemical reactions in liquid phase, it is necessary to check after irradiation whether the radioactive concentration of 85Kr dissolved in the solution is below permissible level or not. Measurements were made on solutions ranging in concentration from 1×10-3-1× 100kBq/g (1×10-4 to 1×10-1 μCi/g) by the use of an end-window GM counter for β-rays. In the present paper, the method of making up the calibration curve for 85Kr solution is studied, together with some problems in measurement.
The calibration curve for 85Kr solution was represented as N=1.8×105 C. In addition, the method for measuring concentration of dissolved 85Kr was established by resolving problems relating to the volatilization of 85Kr in measurement.
