A dip detector for in situ measuring of /sup 137/Cs specific soil activity profiles

Field method for measurement of Cs-137 contamination depth profile is described. Method is based on the use of a collimated dip detector created as a gamma-ray probe: CsI(Tl) scintillating crystal+PIN photodiode+front end electronics. The presented technique of measurements allows determination of specific activity distribution with spatial distribution of 5 cm. Exposure time for one point in distribution profile is less than 180 sec if levels of specific activity are more than 50 Bq/kg. This method may be allied for efficient and quick inspection of contaminated river's flood planes in areas with leakage of radioactive wastes. Application of method for such task gives effective solution to obtain qualitative and quantitative characteristics of contamination.