Estimation of the indoor radon and the annual effective dose from granite samples

International Nuclear Science and Technology Conference 2014

Sola, P.^1 ; Srinuttrakul, W.^1 ; Kewsuwan, P.^1

Thailand Institute of Nuclear Technology, Ongkharak, Nakhon Nayok, Thailand^1

关键词: Annual effective dose;    Average values;    Exposure limits;    General publics;    Indoor radon;    International commission on radiological protections;    Radon concentrations;    Radon exhalation rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/611/1/012013/pdf
DOI  :  10.1088/1742-6596/611/1/012013

来源: IOP

【 摘 要 】

Inhalation of radon and thoron daughters increases the risk of lung cancer. The main sources of indoor radon are building materials. The aim of this research is to estimate the indoor radon and the annual effective dose from the building materials. Eighteen granite samples bought from the markets in Thailand were measured using an ionization chamber (ATMOS 12 DPX) for the radon concentration in air. Radon exhalation rates were calculated from the radon concentration in chamber. The indoor radon from the granite samples ranged from 10.04 to 55.32 Bq•m-2•h-1with an average value of 20.30 Bq•m-2•h-1and the annual effective dose ranged from 0.25 to 1.39 mSv•y-1with an average value of 0.48 mSv•y-1. The results showed that the annual effective doses of three granite samples were higher than the annual exposure limit for the general public (1 mSv•y-1) recommended by the International Commission on Radiological Protection (ICRP). In addition, the relationship between the colours and radon exhalation rates of granite samples was also explained.