DETECTOR CALIBRATION FOR IN SITU GAMMA RAY SPECTROMETRY

摘要

The power in the technique of in situ spectrometry lies in the fact that a detector placed over a ground measures gamma radiation from sources over an area of several hundred square meters. The "field of view" for the detector would be larger for higher energy sources and for sources closer to the soil surface. In contrast, a soil sample would represent an area of a few tens or hundreds of square centimeters. In practice, an effective characterization of a site would involve in situ gamma ray spectrometry in conjunction with soil sampling. As part of an overall program, in situ gamma ray spectrometry provides a means to assess the degree of contamination in areas during the course of operations in the field, thus guiding the investigator on where to collect samples. It can also substantially reduce the number of samples that need to be collected and subsequently analyzed.