The Study of Thoron and Radon Progeny Concentrations in Dwellings in Japan

Guo, Qiuju; Shimo, Michikuni; Ikebe, Yukimasa; Minato, Susumu

doi:10.1093/oxfordjournals.rpd.a081560

Cited by 31 publications

(15 citation statements)

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“…As a result, extensive measurements of thoron levels in Austria, Japan, Sweden, etc. were carried out (Guo et al, 1992;Doi et al, 1992;Steinhausler et al, 1994;Mjones, 1997). In India, an extensive survey is being done on thoron levels in high background radiation areas (Paul and Gupta, 1998;Mayya et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…The 232 Th activity concentrations in major part of the land including rock and different types of soil range from 7 to 50 Bq kg À1 (UNSCEAR, 1998) with higher concentrations generally found in granites and gneissic rocks. Recent surveys show that the contribution from thoron daughters in certain Japanese wooden and mud houses represents a significant fraction of the total lung exposure (Guo et al, 1992;Doi et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Thoron levels in the dwellings of Hyderabad city, Andhra Pradesh, India

Reddy

et al. 2004

Journal of Environmental Radioactivity

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thoron levels in the dwellings of Hyderabad city, Andhra Pradesh, India

Reddy

et al. 2004

Journal of Environmental Radioactivity

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“…The surveyed area covered 1800 km 2 , from 113°46' E to 114°37' E, and from 22°27' N to 22°52' N. There is a subtropical oceanic climate with the average annual temperature of 22.4°C in SC.…”

Section: Overview Of Investigation Areamentioning

confidence: 99%

The characteristics of radon and thoron concentration from soil gas in Shenzhen City of Southern China

et al. 2016

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Radon (222Rn) and thoron (220Rn) from soil gas are very significant factors that can affect the indoor radon level in the first floor or in the basement. China is one of the countries with the highest thorium content in the world. Therefore, it is very significant to study 222Rn/220Rn concentration in the soil in Shenzhen City (SC). A 222Rn/220Rn survey was performed using a portable radon monitor (model RAD7) at 69 sites, covered a total area of 1800 km2 in 2013 to get the original data for radon risk estimation in SC. The average values of 222Rn and 220Rn concentration of soil gas of the total 69 locations are 86 ± 72 kBq·m−3 and 118 ± 85 kBq·m−3, respectively. 222Rn/220Rn concentrations are related to geological lithology. 222Rn concentrations vary from 40 to 370 kBq·m−3 and from 15 to 118 kBq·m−3 in weathered granite products and sediments, respectively, while 220Rn concentrations are from 103 to 435 kBq·m−3 and 2.2 to 96 kBq·m−3. The higher 220Rn values were mainly observed at the sites covered by the weathered granite products. Comparing with the areas of high 222Rn concentration, the areas of high 220Rn values are larger. The distribution of 222Rn concentration in the vertical direction displays an exponential distribution mode, but there is no rule of 220Rn concentration. The investigation suggests that people should pay attention to 220Rn contribution in the radon mapping of SC, as well as in the indoor radon survey.

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“…Limited 220 Rn-progeny surveys indicate a mean indoor progeny level between 0.1 and 2 Bq m −3 , with a maximum up to about 5 Bq m −3 (Mjönes et al, 1992;Guo et al, 1992;Reineking et al, 1992). Theoretical risk estimates project up to 4000 deaths annually due to indoor 220 Rn-progeny induced lung cancer in the USA (Schery, 1990).…”

Section: Introductionmentioning

confidence: 99%