Estimation of effective dose rates caused by radon and thoron for inhabitants living in rare earth field in northwestern Vietnam (Lai Chau province)

Radiological risk assessment of outdoor 222Rn and 220Rn around rare earth element and uranium mines from northern Vietnam

“…The average 222 Rn and 220 Rn concentrations were several times higher than the worldwide outdoor average of 10 Bq m −3 (UNSCEAR 2000). The result was similar to the previous report in the rare earth mine in Lai Chau province(Phon et al 2015). The average 222 Rn and 220 Rn concentrations in NX-Lai Chau reached the highest value among the eight studied sites.…”

“…The concentrations and radiation doses due to inhalation of 222 Rn and 220 Rn have been also extensively investigated worldwide (Iida et al 1996, Chung and Tokonami 1998, Wang 2002, Bochicchio et al 2003, Oikawa et al 2003, Phon et al 2015, Omori et al 2016, Ayres da Silva et al 2018, Kojo et al 2021. In general, the 222 Rn and 220 Rn concentrations in the soil and air depend on the types of rocks, their migration from rock to soil, the release of 222 Rn and 220 Rn from the soil and rock to the atmosphere, and the weathering characteristics, it therefore varies from one site to another.…”

The First Attempt to Reevaluate Radon and Thoron Exposure in Gansu Province Study Using Radon-Thoron Discriminating Measurement Technique

“…These results and those of the present study suggested that the mean radon concentration was unlikely to exceed 100 Bq m −3 in this same and nearby areas. In recent years, some papers reported discriminative monitors have been used for long-term measurements of indoor radon and thoron (22)(23)(24)(25).…”