Environmental Alpha and Gamma Survey

Radon data in soil and gamma and radon levels in air have been obtained for several years at the site of a Nuclear Research Centre and at a Radioactive Waste Storage Facility. Radon detection was carried out with SSNTD while for gamma levels TLD was used. Cross checking of gamma levels in air using gamma scintillation counting was also performed. The results obtained at the site of the Nuclear Research Centre showed a stability over time in the local average radioactive environment except for seasonal fluctuations essentially due to meteorological parameters which were continuously recorded. Results obtained at the Radioactive Waste Storage Facility indicate average gamma levels in air of 0.2 µGy.h-1 for most of the monitoring stations. One station with a higher radioactivity level was systematically observed. Measurements of radon in air up to 150 cm indicate a rapid dilution in the atmosphere.