Exposures from radon, thoron, and thoron progeny in high background radiation area in Takandeang, Mamuju, Indonesia
Saputra Miki Arian,
Nugraha Eka Djatnika,
Purwanti Tri,
Arifianto Rokhmat,
Laksmana Roza Indra,
Hutabarat Richard P.,
Hosoda Masahiro,
Tokonami Shinji
Affiliations
Saputra Miki Arian
Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan, and Center for Nuclear Minerals Technology – National, Nuclear Energy Agency of Indonesia, Jl. Ps. Jumat, Lebak Bulus Raya No. 9, Cilandak, Jakarta, Selatan 12440, Indonesia
Nugraha Eka Djatnika
Center for Technology of Radiation Safety and Metrology National Nuclear Energy Agency of Indonesia Jl. Lebak Bulus Raya No. 49, Jakarta 12440, Indonesia
Purwanti Tri
Center for Nuclear Minerals Technology – National Nuclear Energy Agency of Indonesia, Jl. Ps. Jumat, Lebak Bulus Raya No. 9, Cilandak, Jakarta, Selatan 12440, Indonesia
Arifianto Rokhmat
Center for Nuclear Minerals Technology – National Nuclear Energy Agency of Indonesia, Jl. Ps. Jumat, Lebak Bulus Raya No. 9, Cilandak, Jakarta, Selatan 12440, Indonesia
Laksmana Roza Indra
Center for Nuclear Minerals Technology – National Nuclear Energy Agency of Indonesia, Jl. Ps. Jumat, Lebak Bulus Raya No. 9, Cilandak, Jakarta, Selatan 12440, Indonesia
Hutabarat Richard P.
Center for Nuclear Minerals Technology – National Nuclear Energy Agency of Indonesia, Jl. Ps. Jumat, Lebak Bulus Raya No. 9, Cilandak, Jakarta, Selatan 12440, Indonesia
Hosoda Masahiro
Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan and Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan
Tokonami Shinji
Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan
The exposure from radon, thoron, and thoron progeny was measured for 45 dwellings in high background radiation area in Takandeang, Indonesia with ambient dose equivalent rate ranging from 0.34 μSv h−1 to 1.90 μSv h−1. The measurement was taken using passive radon and thoron discriminative detector and thoron progeny detector. This measurement was taken from November 2018 to October 2019, and within one month the detector would be replaced with a new detector. The concentrations of radon, thoron, and thoron progeny were calculated as 42–490 Bq m−3, 20–618 Bq m−3, and 4–40 Bq m−3, respectively. The concentrations for outdoor were 49–435 Bq m−3, 23–457 Bq m−3, and 4–37 Bq m−3, respectively, and the annual effective dose was 9.8–28.6 mSv y−1. Based on the result of Spearman’s correlations analysis between the indoor radon and thoron concentrations and between the indoor thoron progeny and thoron concentrations, we suggest that exposure to thoron cannot be predicted from exposure to radon, and the equilibrium equivalent thoron concentration has a large uncertainty when it is estimated from thoron concentration assuming a single thoron equilibrium factor.
