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Abstract
Radon, thoron and their progeny levels are significant natural sources of radiation exposure for the general population in both living and working places. The concentration of radon varied from 15 Bq/m3 to 78 Bq/m3 with an average of 46 Bq/m3, while thoron concentration varied from 11 Bq/m3 to 26 Bq/m3 with an average of 18 Bq/m3.
The concentration of radon progeny (EERC) varied from 10 Bq/m3 to 26 Bq/m3 with an average of 18 Bq/m3, while the concentration of thoron progeny (EETC) varied from 0.56 Bq/m3 to 1.91 Bq/m3 with an average of 1.11 Bq/m3. The value of the equilibrium factor for radon varied from 0.19 to 0.76 with an average of 0.37 while for thoron it varied from 0.02 to 0.12 with an average of 0.06.
Our experimental finding confirmed that the indoor radon, thoron and their progeny concentration were within internationally accepted norms.
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References
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References
BEIR (1999) Report of the Committee on the Bilogical Effects of Ionizing, Natl. Res council. Natl. Acad. Press. , Washington D.C.Haerting, F.H. and Hesse, W., (1879)., Health Phys. 30, 296
IAEA, Bulletin of International Atomic Energy Agency, (1988). 88-3069. IAEA/PI/A 114 E.
Anil Kumar, R.B.S.Rawat, Brij Nandan singh (2015). Study of seasonal variation of indoor radon concentration and its coorelation with thoron concentration in Shahjahanpur district of central Uttar Pradesh. Geo- Hazard recent research PP. 90-95
ICRP, International Commission on Radiological Protection. (2000). ICRP Publication No. 85, Annals of the ICRP, Pergamon Press, New York.
Mishra Rosaline and Mayya Y.S., 2008. Study of a deposition based Direct Thoron Progeny Sensor (DTPS) technique for estimating Equilibirium Equivalent Thoron Concentration (EETC) in indoor environment. Radiation Measurement, 43, 1408-1416.
https://doi.org/10.1016/j.radmeas.2008.03.002 DOI: https://doi.org/10.1016/j.radmeas.2008.03.002
Martz, D. E., Rood, A. S., George, J. L., Pearson, M. D., Langner Jr., H. (1991) Year to year to year variations in annual average indoor radon concentrations. Health Phys. 61, 413
https://doi.org/10.1097/00004032-199109000-00012 DOI: https://doi.org/10.1097/00004032-199109000-00012
PMid:1880029
Narayanan, K.K., Krishnan, D. and Subbaramu, M.C., (1991). ISRP (K)-BR-3, ISRP, Kalpakkam Chapter.
Ramola, R.C., Rawat, R.B.S., Kandari, M.S., Ramachandran, T.V., Eappen, K.P. and Subba Ramu, M.C. (1996). Indoor Built Environ. 5, 364-366.
https://doi.org/10.1159/000463753 DOI: https://doi.org/10.1159/000463753
Ramachandran, T.V. (1998) Proc. 11th National Symposium on Solid State Nuclear Track Detectors, Amritsar, pp. 50-68.
Sahoo, B.K., Sapra, B.K., Kanse, S.D., Gaware, J.J., Mayya, Y.S., 2013. A new pin-hole discriminated 222Rn/220Rn passive measurement device with single entry face. Radiat. Meas.
https://doi.org/10.1016/j.radmeas.2013.08.003 DOI: https://doi.org/10.1016/j.radmeas.2013.08.003
Subba Ramu M.C., Muraleedharan T.V. And Sheikh A.N., ""Methods and Measurements of Indoor Levels of Rn222 and its Daughters"" BARC Rep. No. 1390, 1988.
UNSCEAR (2000), United Nations Scientific committee on the effects of Atomic Radiations, Report to the General Assembly, United Nations, New York.