Natural Radioactivity, Radon Exhalation Rates and Radiation Doses in the Soil Samples Collected from the Vicinity of Kolaghat Thermal Power Plant, West Bengal, India

Indian Journal of Pure & Applied Physics

article

Roshan Lal Sharma¹  Ajay Kumar Mahur¹  Rohit Mehra²  Sansar Chand²  S Asad Ali³  D Sen Gupta⁴  Hargyan Singh⁵ 

[1] Department of Applied Science, Vivekananda College of Technology and Management;Department of Physics, Dr B.R Ambedkar National Institute of Technology;Department of Applied Physics, Z H College of Engineering, Aligarh Muslim University;Department of Geology & Geophysics, Indian Institute of Technology;Department of Physics, Sri T R Girls PG College

关键词: NaI(Tl);    Hazard Index;    Annual effective dose;    Radon activity;    Gamma radiation representation level index;    Article;   

DOI  :  10.56042/ijpap.v61i8.2795

来源: National Institute of Science Communication and Information Resources

【 摘 要 】

Natural radioactivity has been determined by means of a highly efficient thallium-doped sodium iodide detector in soil sample from surface of from vicinage of “Kolaghat Thermal Power Plant” The activity concentration (specific activity) is found to vary from 23.70 ± 3.41 to 33.90 ± 4.33 Bqkg-1 for 226Ra, from 6.67 ± 2.01 to 21.60 ± 2.11 Bqkg-1 for 232Th and that for 40K from 461.01 ± 66.16 to 610.25 ± 80.87 Bqkg-1 with expected value of 29.26 ± 3.50, 4.86 ± 2.03 and 517.53 ± 71.61 Bqkg-1 of Radium-226, Thorium-232 and Potassium-40 correspondingly. The radon exhalation rates were also computed from all samples using the "Sealed Can Technique”. The activity due to radon fluctuates from 47.9 ± 6.2 to 157.6 ± 11.3 Bqm-3 having an arithmetic mean of 89.3 ± 7.9 Bqm-3. The surface exhalation rate and mass exhalation rates were estimated to fluctuate from17.3 ± 2.2 to 56.8 ± 4.1 mBqm-2h-1 with an expectation of 32.1 ± 3.0 mBqm-2h-1 and from 0.6 ± 0.1 to 2.1 ± 0.2 mBqkg-1h-1 averaged out to 1.2 ± 0.1 mBqkg-1h-1respectively. Radiation doses were also calculated in these samples. Indoor and outdoor annual effective doses, Absorbed dose rates, External Hazard index and Indoor inhalation exposure, also known as radon effective dose, was computed and varied from 0.19 to 0.25 mSv y-1, 39.30 to 51.61 nGyh-1, 0.048 to 0.063 mSvy-1, 0.21 to 0.28 and 0.29 to 0.36 and 2.04 to 6.70 μSvy-1 respectively. The values which were obtained in this study are found to be well below the allowed permissible limits, so the soil may be used as building construction material.

【 授权许可】

Unknown