| Autor: |
Haanes H; Norwegian Radiation and Nuclear Safety Authority, 0213 Skøyen, Norway.; Centre for Environmental Radioactivity (CERAD CoE), NO-1432 Ås, Norway., Finne IE; Norwegian Radiation and Nuclear Safety Authority, 0213 Skøyen, Norway., Skjerdal HK; Norwegian Radiation and Nuclear Safety Authority, 0213 Skøyen, Norway., Rudjord AL; Norwegian Radiation and Nuclear Safety Authority, 0213 Skøyen, Norway.; Centre for Environmental Radioactivity (CERAD CoE), NO-1432 Ås, Norway. |
| Jazyk: |
angličtina |
| Zdroj: |
Radiation research [Radiat Res] 2019 Aug; Vol. 192 (4), pp. 431-439. Date of Electronic Publication: 2019 Aug 07. |
| DOI: |
10.1667/RR15403.1 |
| Abstrakt: |
Radon ( 222 Rn) and thoron ( 220 Rn), and especially their short-lived decay products, are major contributors to dose received by the public from naturally occurring radioactive material (NORM), particularly in areas with elevated levels of naturally occurring radionuclides. Mining in such areas can involve ventilation of high amounts of these gases, which may influence outdoor levels. In this work, we assessed indoor and outdoor levels of 222 Rn, 220 Rn and 220 Rn decay products (TnDP) in close proximity to an area with elevated bedrock levels of thorium ( 232 Th) and a NORM legacy mining site with high natural ventilation. We assess municipal buildings at distances from a few hundred meters to 2 km from the NORM legacy mines. In some buildings, high indoor levels of 222 Rn were observed in winter, as expected for temperate areas. In summer, high indoor levels of 222 Rn and 220 Rn were observed in some buildings, and very low associated levels of TnDP in actively ventilated buildings may suggest entry by ventilation and an outdoor source. Outdoor levels of TnDP increased with decreased distance from the legacy mines, suggesting dispersal from these during both summer and winter. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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