In-situ-gamma ray spectrometry for measurements of environmental radioactivity

摘要

A detailed description of the method is presented. The range of application is shown. The calibration of the in-situ gamma ray spectrometer with a HPGe semiconductor detector and the evaluation of the spectra are described. A measuring time of about 15-30 min is sufficient to determine the specific natural and man-made radioactivity of the soil of some ten Bq/sq m. The results of soil contamination measurements in Germany after the Chernobyl accident are reported. A total of 22 nuclides are detected. The measured contamination for the first days after the accident was as follows: Te-132/I-132 - 100 kBq/sq m, and I-131 - 70 kBq/sq m. 6 figs., 4 tabs. (orig.). (Atomindex citation 26:044445)