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TECHNICAL NOTE
Year : 2018  |  Volume : 41  |  Issue : 2  |  Page : 94-98

Assessment of natural background gamma radiation levels in and around Loktak Lake of Manipur, India


1 Department of Radiotherapy, RCC, RIMS, Imphal, Manipur, India
2 Department of Physics, Oriental College, Imphal, Manipur, India

Correspondence Address:
Dr. Arunkumar B Sharma
Department of Radiotherapy, RCC, RIMS, Imphal, Manipur
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/rpe.RPE_32_17

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Natural pollution level due to terrestrial gamma radiation was measured at about seventy different sites in and around the Loktak Lake of Manipur, India, using NaI (Tl) scintillator-based Micro-R-survey meter, and high purity germanium detector. The observed annual effective dose in this study area ranges from 0.3 to 1.2 mSvy−1 with an average value of 0.7 ± 0.1 mSvy−1, which is higher than world average value of about 0.4 mSy−1 reported by the UNSCEAR 2000. The soil analysis for 226Ra, 232Th, and 40K of this area gives an average concentration of 74.6 (38.9-126.0) Bq/kg, 112.1 (30.2–224.3) Bq/kg, and 792.9 (287.4–1194.8) Bq/kg, respectively.


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