Determination of levels of radioactive contamination of separate sites in the Belarusian sector of the Chernobyl NPP exclusion zone by in situ direct physical measurements

The objectives and tasks of the project GAMFAC are presented as well as preliminary work executed by the collaborators of the Palesse State Radiation-Ecological Reserve. It included: choosing of six test sites with different level of Cs 137 content in soil; soil sampling and their gamma-spectrometry measurements to determine the density contamination of the territory and depth distribution of the radionuclides in different soil types. The results of in situ measurements fulfilled by different teams were very close to each other. These results were also close to the data received by the collaborators of the reserve. The results of the projects have shown that method of in situ measurements could be useful in forestry activity of radiation-ecological reserve. (authors)