Study of background radiation dose in Mysore city, Karnataka State, India

Sannappa, J.; Chandrashekara, M. S.; L.A.Sathish,; Paramesh, L.; Venkataramaiah, P.

doi:10.1016/s1350-4487(02)00126-9

Cited by 73 publications

(28 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For calculating the radon and thoron progeny levels in mWL the indoor equilibrium factor of 0.4 for radon and 0.1 for thoron are used (UNSCEAR, 1992). Annual dose received by the inhabitants in the dwellings under study in mSv was estimated using the relation (Sannappa et al, 2003 where, F R and F T are equilibrium factor for Radon and thoron having value of 0.4 and 0.1, C R and C T are radon and thoron concentration…”

Section: Measurement Of Indoor Radon and Thoron Concentrationmentioning

confidence: 99%

Study of Indoor Radon, Thoron, Their Progeny Concentration and Radon Exhalation Rate in the Environs of Mohali, Punjab, Northern India

Mehta

Singh

Chauhan

et al. 2015

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Radon and its progeny are major contributors that deteriorate the indoor air quality and are the major source of radiation dose received by general population of the world. Keeping this in mind the environmental monitoring of radon-thoron and their progeny in dwellings of district Mohali, Punjab, India has been carried out. The radon-thoron twin dosimeter cups were used for the study. The study of the exhalation rate of the soil samples of Kharar, Kurali and Derabassi of the district Mohali and the sand samples available from the study area has also been carried out for the comparison purpose using can echnique. The aim of the study is the possible health risk assessment in the dwellings of this particular region for which data is not available in literature. The indoor radon concentration varied from 22.8 ± 0.7 Bq/m 3 to 45.0 ± 2.2 Bq/m 3 with an average of 33.7 Bq/m 3 while the thoron concentration in the same dwellings varied from 1.7 ± 0.1 Bq/m 3 to 27.6 ± 1.2 Bq/m 3 with an average of 12.8 Bq/m 3 . Annual dose received by the inhabitants in the dwellings under study varied from 0.64 to 1.64 mSv with an average of 1.19 mSv. The radon mass and surface exhalation rates of the soil samples varied from 0.32 to 2.6 mBq/kg/h with an average of 1.36 ± 0.2 mBq/kg/h and from 7.3 to 58.2 mBq/m 2 /h with an average of 28.3 ± 5.1 mBq/m 2 /h respectively.

show abstract

Section: Measurement Of Indoor Radon and Thoron Concentrationmentioning

confidence: 99%

Study of Indoor Radon, Thoron, Their Progeny Concentration and Radon Exhalation Rate in the Environs of Mohali, Punjab, Northern India

Mehta

Singh

Chauhan

et al. 2015

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

show abstract

“…The annual effective dose due to exposure to radon ( 222 Rn) and its progeny, and average lifetime fatality risk were determined using generic relations (ICRP 1993b;Sannappa et al 2003). ICRP assumes 80% indoor occupancy (7000 h/year) and an indoor equilibrium factor of 0.4 between radon and its decay products for dwellings, the annual exposure at home to radon progeny per unit radon concentration of 1.56 × 10 −2 mJ h m −3 per Bq m −3 and effective dose per unit exposure at home to radon progeny of 1.1 mSv (mJ h m −3 ).…”

Section: Dosimetry Of Radon Progeny / Daughtersmentioning

confidence: 99%

Estimates of the dose of radon and its progeny inhaled inside buildings

Ravikumar

Somashekar

2013

European Journal of Environmental Sciences

View full text Add to dashboard Cite

The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m 3 to 14.27 ± 1.50 Bq/m 3 with a mean of 6.31 ± 3.47 Bq/m 3 while that of the progeny of radon varied from 0.007 to 0.057 WL (average: 0.025). The mean indoor concentration of radon was considerably less than the lower levels prescribed by EPA (148 Bq/m 3 ), WHO (100 Bq/m 3 ), EEC (400 Bq/m 3 ), ICRP (200-600 Bq/m 3 ) and NRPB (200 Bq/m 3 ). The annual effective equivalent dose of indoor radon (< 0.8 mSv/y) that the bronchial and pulmonary regions of human lungs are exposed to (<0.8 mSv/y) is less than the UNSCEAR and WHO recommended global lower average dose value of 1 mSv/y. The lifetime fatality risk of exposure to the progeny of radon (PAEC) varied from 0.03 × 10 −4 to 0.19 × 10 −4 , with an average value of 0.08 ± 0.04 × 10 −4 .

show abstract

“…The exposure rate measured in µRh -1 was converted into absorbed dose rate nGy/h using the conversion factor of 1 µRh -1 = 8.7 nGy/h. (Sannapa et al, 2003;Kam and Ahmet, 2007). The readings are represented in terms of nGy/h.…”

Section: Indoor Radon Concentration Outdoor Gamma Dose Ratesmentioning

confidence: 99%