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Evaluation of gamma radiation exposure in a room from construction material

Authors:

CS Sumithrarachchi ,

Radioisotope Centre, University of Colombo, Colombo 03, Sri Lanka, LK
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AS Amerasekera,

Department of Physics, University of Colombo, Colombo 03, Lanka, LK
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R Hewamanna,

Radioisotope Centre, University of Colombo, Colombo 03, Sri Lanka, LK
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SRD Rosa

Department of Physics, University of Colombo, Colombo 03, Lanka, LK
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Abstract

The presence of radioactivity in building materials can be a potential hazard from external exposure to gamma and beta radiation. Indoor radiation comes mainly from the activity concentration of the natural radionuclides of 238U, 232 Th and 40K in building materials. The calculations presented in this paper indicate if clay bricks containing average activity concentrations of 35, 72 and 585 Bq kg-1of 226Ra, 232Th and 40K respectively are used to construct walls of a room of dimensions 3 m x 3 m x 0.1 m and 3.6 m x 3 m x 0.1 m the annual effective gamma radiation dose to a person with an occupancy factor of one is 1.65 mSv. This result can therefore be regarded as an upper limit on the expected exposure. Considering average activity concentrations of 55, 56 and 39 Bq kg-1 for 226 Ra, 129, 50 and 44 Bq kg-1 for 232Th, 1349, 1436 and 1725 Bq kg-1 for 40K for granite, Lanka and Royal Ceramic floor tiles respectively the annual gamma exposure due to these floor materials is 92, 69 and 61 nSv. The results suggest the exposure from the floor materials to be insignificant. The annual effective dose from construction materials is directly proportional to the activity concentration of the radionuclides present in the construction materials.

doi:10.4038/sljp.v1i0.171

Sri Lankan Journal of Physics, Vol.1 (2000) 73-79

How to Cite: Sumithrarachchi, C. et al., (2000). Evaluation of gamma radiation exposure in a room from construction material. Sri Lankan Journal of Physics. 1, pp.73–79. DOI: http://doi.org/10.4038/sljp.v1i0.171
Published on 17 Dec 2000.
Peer Reviewed

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