ANNUAL EFFECTIVE DOSE ASSESSMENT DUE TO RADON AND THORON PROGENIES IN DWELLINGS OF KILIMAMBOGO, KENYA
| Autor: | Masahiro Hosoda, N. O. Hashim, C Nyambura, Hiromi Kudo, M. W. Chege, Takahito Suzuki, Shinji Tokonami |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Radon Daughters
chemistry.chemical_element Radon Radiation Dosage 010403 inorganic & nuclear chemistry 01 natural sciences Effective dose (radiation) 030218 nuclear medicine & medical imaging Ionizing radiation 03 medical and health sciences 0302 clinical medicine Radiation Monitoring Humans Thoron Progeny Radiology Nuclear Medicine and imaging Radiation Radiological and Ultrasound Technology Thorium Radiochemistry Public Health Environmental and Occupational Health General Medicine Radiation Exposure Kenya 0104 chemical sciences chemistry Air Pollutants Radioactive Air Pollution Indoor Housing Uranium Environmental science |
| Zdroj: | Radiation Protection Dosimetry. 184:430-434 |
| ISSN: | 1742-3406 0144-8420 |
| DOI: | 10.1093/rpd/ncz090 |
| Popis: | Human beings are continuously exposed to ionising radiation originating from natural or artificial sources. Uranium-238 and Thorium-232 found in building materials are important sources of radon and thoron in the indoor environment. The concentration levels of radon, thoron and thoron progeny were measured in mud-walled, metallic or iron sheet-walled and stone-walled modern houses in Kilimambogo region, Kenya for 3 months. Radon and thoron concentration levels were measured using passive radon–thoron discriminative monitors (RADUET), while thoron progeny concentrations as the equilibrium equivalent thoron concentration (EETC) were measured using thoron progeny monitors. The mean radon concentration levels in mud, metallic and stone-walled dwellings were 67 ± 11, 60 ± 10 and 75 ± 10 Bq m−3, respectively. The mean thoron concentration levels in the corresponding dwellings were 195 ± 36, 71 ± 24 and 161 ± 31 Bq m−3, respectively, while EETCs were 12 ± 2, 3 ± 1 and 7 ± 1 Bq m−3, respectively. The annual effective doses for radon were 1.3 ± 0.2, 1.1 ± 0.1 and 1.4 ± 0.2 mSv y−1 in mud, metallic and stone-walled houses while those from thoron estimated from EETC were 2.4 ± 0.4, 0.5 ± 0.1 and 1.5 ± 0.2 mSv y−1 in the corresponding houses, respectively. |
| Databáze: | OpenAIRE |
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