Measurements of the equilibrium factor for 222Rn daughters in dwellings in India.
ABSTRACT As part of an ongoing project to assess the population dose from indoor radon and its daughters in India, a set of parallel measurements was made in more than 150 houses of different types to estimate indoor radon and progeny levels. Time-integrated solid state nuclear track detectors were employed for the measurement of radon concentration and potential alpha energy exposure level. From these values the equilibrium factor (F) between radon and its progeny was estimated for each house. An average F value of 0.39 was obtained.
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ABSTRACT: In the present paper, the results of radon activity recorded in domestic regions of the Kulu area (Himachal Pradesh, India) known for uranium mineralisation are reported. Time integrated track etch technique has been used for the measurement of indoor radon levels. Bare cellulose nitrate LR-115 type II films have been used as detectors in the survey of radon. The calibration constant of per WL of radon at equilibrium (which corresponds to per ) determined by Subba Ramu et al. (Sci. Total Environ. 73 (1988) 245) has been used to express radon activity in . In some of the dwellings the levels of radon activity are found to be quite high giving an annual exposure dose that crosses the safety limits set by the International Commission on Radiological Protection (ICRP, Protection against radon-222 at home and at work, ICRP Publication 65, Annals of the ICRP, 23 (2), 1993). A study of seasonal variations of indoor radon in some of the dwellings has also been carried out.Radiation Measurements. 01/2001;
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ABSTRACT: Coal contains naturally occurring radionuclides arising from the uranium and thorium series. Burning of coal is one of the sources of the technologically enhanced exposure of human beings from natural radionuclides. The population is exposed to radiation which are discharged to the environment by the emissions from thermal power stations in gaseous and particulate form containing radioisotopes. This paper presents the measurements of airborne radon levels in the coal fired thermal power plants at Kasimpur (Uttar Pradesh), Lahra Mohabat at Bhatinda (Punjab) and at Durgapur (West Bengal) in India. Radon levels in the plants are found to be higher than in the Indian dwellings. Potential alpha activity, radon and its daughter concentration, and effective dose equivalent are obtained.Radiation Measurements. 01/2003;
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ABSTRACT: This paper reports on radon concentrations in dwellings from fifty different locations of India. The incorporated data were obtained using the passive solid state nuclear track detector technique. The estimated geometric mean value for India is 67.1 Bq m(-3). Chuadanga in Bangladesh had the lowest observed indoor radon concentration of 27.3 Bq m(-3) and Una in the northern part of India had the highest concentration of 281.5 Bq m(-3). This paper discusses the national geometrical mean value in terms of the national geometric mean values of other countries and also in terms of the geological influence. The estimated indoor radon levels are compared with the indoor radon levels as recommended by the International Commission on Radiation Protection (ICRP). It was observed that there are several locations in India where dwellings have higher indoor radon levels than the ICRP recommended value and requires some sort of intervention from regulating authorities. The mean value for indoor radon level given in the report of UNSCEAR 2000 for India needs to be revised.Journal of Environmental Radioactivity 02/2005; 78(1):113-21. · 2.12 Impact Factor