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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.48 [2010] >
IJPAP Vol.48(07) [July 2010] >
| Title: | Radon activity and exhalation rates in Indian fly ash samples |
| Authors: | Kant, K
Rashmi
Sonkawade, R G
Chauhan, R P
Chakarvarti, S K
Sharma, G S |
| Keywords: | Radon
Uranium
Thorium
Radium
Health
Environment
Coal
Fly ash
Exhalation rate |
| Issue Date: | Jul-2010 |
| Publisher: | CSIR |
| Abstract: | Fly ash is the by-product
of burnt coal which is naturally occurring radioactive material (NORM). Because
of human activity and its use in manufacturing of bricks, sheets, cement, land
filling etc may present a radiation hazard to people and the environment Thus,
it is very important to carry out radioactivity measurements in fly ash from
the health and hygiene point of view In the present study, the
activity concentrations of 238U, 232Th and 40K
have been varied from 99 ± 2 to
203 ± 4 Bq/kg, 145 ± 2 to 288 ± 4 Bq/kg, and 355 ± 5 to 516 ± 6
Bq/kg, respectively in various fly ash samples The
radium equivalent activity was varied from 317 to 614 Bq/kg, radon activity varied from 214 to 590 Bq/m3, radon
exhalation rate varied from 7.8 to 21.6 mBqkg-1h-1 for mass exhalation rate and from
138 to 381 mBqm-2h-1 for surface exhalation rate in the fly ash samples used in the
present investigation The absorbed dose varied from 143 to 277 nGyh-1, the indoor annual effective dose
varied from 0.70 to 1.36 mSv and the outdoor annual effective dose varied from
0.17 to 0.34 mSv In all the samples, the activity concentration of 238U, 232Th
and 40K was found to be below the
permissible levels A strong positive correlation has been observed between
uranium concentration, radon activity and radon exhalation rate. |
| Page(s): | 457-462 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.48(07) [July 2010]
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