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EVS-EN ISO 11665-1:2019 Radioaktiivsuse mõõtmine keskkonnas : õhk : radoon-222. Osa 1, Radooni ja selle lühikese poolestusajaga lagunemissaaduste päritolu ning nendega seotud mõõtmismeetodid = Measurement of radioactivity in the environment : air : rad...