Development of in-situ measurement for 90 Sr specific activity by beta-ray survey meter combined with sensitivity correction by Monte Carlo calculation.

摘要

The objective of this study was to develop an in-situ measurement technique for the instant detection of the (90)Sr contamination. A numerical method to correct the detection efficiency of the beta survey meter was applied for an elk antler sample from the vicinity of the Mayak facility. The estimated (90)Sr specific activity of 0.21+/-0.04 Bq/g agrees within the factor of two to the value 0.11+/-0.06 Bq/g evaluated with the imaging plate, which was previously validated. Also, the dependence of the detection efficiency was shown to be an exponential function of the sample thickness and nearly proportional to the area of the sample.