Bommadeni Arun, Viswanathan S, Menaka M, Kothai Parthasarathy, Balasubramaniam Venkatraman
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Evaluation of sampling and analytical uncertainties and estimation of natural radioactivity levels in the soil samples in Kalpakkam, Tamilnadu.
The high-purity germanium (HPGe) detector is used to quantify natural radioactivity concentrations in soil samples. The total uncertainty due to the contribution of the analytical method and sampling uncertainty is evaluated in this study. The relative sampling uncertainty values for 40K, 238U, and 232Th are found to be within 5%. The measured specific activity levels ranged between 225.6 ± 8.5 Bq/kg and 479.6 ± 13.0 Bq/kg for 40K, 12.1.6 ± 1.4 Bq/kg and 73.2 ± 2.7 Bq/kg for 238U, and 48.7 ± 2.6 Bq/kg and 548.7 ± 17.0 Bq/kg for 232Th, respectively. The radiological hazard parameters, such as absorbed dose rates and annual effective dose values, were estimated from the 40K, 238U, and 232Th activity concentration values. The absorbed dose rate values ranged between 45 nGy/h and 383 nGy/h with a mean value of 142 nGy/h. The annual effective dose values ranged from 0.06 mSv/y to 0.47 mSv/y with a mean value of 0.17 mSv/y.
期刊介绍:
Radiation Protection Dosimetry covers all aspects of personal and environmental dosimetry and monitoring, for both ionising and non-ionising radiations. This includes biological aspects, physical concepts, biophysical dosimetry, external and internal personal dosimetry and monitoring, environmental and workplace monitoring, accident dosimetry, and dosimetry related to the protection of patients. Particular emphasis is placed on papers covering the fundamentals of dosimetry; units, radiation quantities and conversion factors. Papers covering archaeological dating are included only if the fundamental measurement method or technique, such as thermoluminescence, has direct application to personal dosimetry measurements. Papers covering the dosimetric aspects of radon or other naturally occurring radioactive materials and low level radiation are included. Animal experiments and ecological sample measurements are not included unless there is a significant relevant content reason.