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Indoor radon data monitored with several different recording systems in a controlled cellar were analyzed. The one-room cellar is carved into volcanic rock and presents an almost constant radon emanation throughout the year. Measurements were performed using the AlphaGUARD ® , Sun Nuclear ® 1027, DOSEman ® and RAD7 ® radon monitors, and CR-39 Lantrack ® in a passive integrating detector. The radon concentrations measured by the active detection systems and averaged over the three-month measurement period ranged from 533 to 805 Bq m −3 . The response of the passive detector system was a linear function for exposure times of one, two and three months. The data are discussed as a function of changes in the distribution of radon within the cellar and the response characteristics of the detection devices.

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.

Systematic monitoring of Rn in soil, background gamma levels and meteorological measurements, have been conducted at the site of a Nuclear Research Center. The data cover a time period of several years. The radon in soil gas fluctuations are influenced by meteorological seasonal changes and by geophysical local parameters and they range between 1000 Bq/m3 and 18000 Bq/m3. The observed gamma levels show geographic stability; some seasonal fluctuations were observed. Data analysis indicates that no significant changes occurred at the site over the measuring time period and radiation levels and meteorological changes are moderate inducing no ecological impact on the surroundings.