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KMID : 1156220190450020099
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Journal of Environmental Health Sciences
2019 Volume.45 No. 2 p.99 ~ p.112
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Effective Doses Estimated According to Characteristics of Airborne Radon and Thoron Levels Generated from Some Household Products
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Park Dong-Uk
Yi Seong-Jin
Kim So-Yeon
Kwak Hyun-Seok
Lee Seung-Hee
Park Ji-Hoon
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Abstract
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Objective: This study aims to analyze the characteristics of airborne radon and thoron level (Bq/m3) generatedfrom household products containing monazites, and estimate the effective doses (mSv/yr).
Method: Radon & Thoron detector EQF3220 was used to monitor real-time airborne radon and thoron level (Bq/m3), and their daughters (Bq/m3) were recorded every two hours. Effective doses (mSv/yr) for radon and thoron were estimated according to models developed by International Commission on Radiological Protection (ICRP) and United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR).
Results: The average levels of radon and thoron were 87.8 Bq/m3(range; 20.8-156.3 Bq/m3) and 1,347.5 Bq/m3(range; 4-5,839.7 Bq/m3), respectively. The average equilibrium factors (F) were 0.23 and 0.007, respectively. The levels of radon progeny were far higher than that thoron. Latex mattress showed the highest F (0.38). The average effective doses were estimated to be ICRP (1.9 mSv/yr) and UNSCER (1.3 mSv/yr) for radon and UNSCEAR (1.6 mSv/yr) for thoron.
Conclusions: Our results have far exceeded the allowable effective dose for general population (1 mSv/yr). The government’s actions such as the ban of use of consumer products containing monazite and the establishment of surveillance system to evaluate health effects for the people affected should be taken as early as possible.
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KEYWORD
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Radon, Thoron, Monazite, Effective dose
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