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Radon level reductin in two kindergartens in Slovenia
Vaupotič, Janja ...
Remedial actions were carried out in two kindergartens with average healting season radon concentrations of about 2,000 Bq ▫$m^{-3}$▫. the first kindergarten is built on sedimentary gravel and the ...second one on fly ash and cinder fill. In both cases, radon accumulated in a sub-floor channel (service tunnel). The channels were opened at both ends. Natural ventilation of the tunnels did not produce a sufficient reduction in radon concentration. A fan was mounted in one kindergarten to ventilate the channel for 20 min three times each day, thus reducing radon levels to an acceptable value.
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