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Systematic indoor radon and gamma measurements in kindergartens and play schools in Slovenia
Vaupotič, Janja ...
Systematic measurements of indoor radon concentrations and gamma dose rates were carried out in the 730 kindergartens and play schools in Slovenia that, together, care for 65,000 children. The main ...method for indoor radon measurement was direct sampling in alpha scintillation cells, but in cases with an increased instanteneous radon concentration, the additional methods of track-etch detectors and alpha spectroscopy were applied. In 528 kindergartens and play schools (72%), radon concentrations were below 100 Bq ▫$m^{-3}$▫, with a geometric mean of 58 Bq ▫$m^{-3}$▫. In 16 kindergartens and play schools (2,2%) radon concentrations exceeded 800 Bq ▫$m^{-3}$▫. In all cases, the main reason for a high indoor radon concentration was the geological structure of the soil. Gamma dose rates were measured with a portable scintillation counter, but in the Ljubljana region thermoluminescence dosimeters were also exposed. The results ranged from 30 to 295 nGy ▫$h^{-1}$▫, with a geometric mean of 88 nGy ▫$h^{-1}$▫.
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