Distribution of137Cs in soil in Central Slovakia and fast prediction of contamination |
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Authors: | F Ďurec |
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Institution: | (1) School of Chemistry, University of Melbourne, 3052 Parkyille, Victoria, Australia;(2) Australian Radiation Laboratory, Lower Plenty Road, 3085 Yallambie, Victoria, Australia |
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Abstract: | This paper describes the measurement of210Bi by Cerenkov counting in a commercial liquid scintillation counter. The counting efficiency in water is 0.17 counts per
second per Becquerel (17%). When the enhancers Triton X-100 (15% v/v) and sodium salicylate (1% m/v) are added to the solution
the counting efficiency for210Bi increases from 17% to 75%. The210Po daughter of210Bi causes interference of 0.85 counts per second per Becquerel in the presence of the enhancers but not in water. When210Bi and210Po are present in secular equilibrium the total counting efficiency is 160%. When210Bi and210Po are not in secular equilibrium the210Po can be removed immediately before counting by plating onto silver foil. The use of the enhancers gives a substantial increase
in counting efficiency compared to counting in water. Compared with solutions used in liquid scintillation counting the enhancer
solution is inexpensive and can be disposed of without environmental hazard. |
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