International Journal of Radiation Research
نشریه پرتو پژوه
Int J Radiat Res
Basic Sciences
http://ijrr.com
79
journal79
2322-3243
2345-4229
10.61186/ijrr
en
jalali
1395
7
1
gregorian
2016
10
1
14
4
online
1
fulltext
en
External dose measurements in the Eloor industrial area in the Ernakulam district of Kerala, India
Radiation Biology
Radiation Biology
گزارش کوتاه
Short Report
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<p>Background: Natural background radiation of a particular region is one of the distinctive factors defining the status of environment. Eloor Island is an industrial area in Ernakulum District of the state of Kerala, India. The indoor and outdoor gamma level measurements have been carried out for the region for evaluating the annual effective dose to the population residing in this area. Materials and Methods: Measurements of indoor gamma dose were done for a whole year using Thermo Luminescent Dosimeters (TLDs) and GM tube based survey meters in forty five selected locations. The activity concentration of <sup>232</sup>Th, <sup>238</sup>U and <sup>40</sup>K in the samples were analyzed using gamma spectrometry. The outdoor external gamma ray dose rates were evaluated from the activity concentration of <sup>40</sup>K, <sup>238</sup>U and <sup>232</sup>Th in the soil samples collected from the study area. Results: The average indoor gamma dose measured using TLDs were found to be 1219 µGy y<sup>-1</sup>. The measured activity in the soil samples had range from 92.5 Bq kg<sup>-1</sup> to 792.8 Bq kg<sup>-1</sup> for <sup>232</sup>Th, 9.2 Bq kg<sup>-1</sup> to 114.6 Bq kg<sup>-1</sup> for <sup>238</sup>U and 265.9 Bq kg<sup>-1</sup> to 851.9 Bq kg<sup>-1</sup> for <sup>40</sup>K. From the observed mean dose levels, the annual effective dose equivalent to population residing in the island has been estimated and is found to be 0.68 mSv y<sup>-1</sup> for indoors and 0.32 mSv y<sup>-1</sup> for outdoors. Conclusion: The annual effective dose equivalent to population estimated for indoor is found to be higher as compared to the global average the same for outdoor was found to be less when compared with the natural background gamma level reported by UNSCEAR for normal background areas</p>
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Keywords: Eloor island, indoor dose, outdoor dose, annual effective dose.
323
329
http://ijrr.com/browse.php?a_code=A-10-1-635&slc_lang=en&sid=1
D.
Balakrishnan
790031947532846009983
790031947532846009983
No
Department of Physics, The Cochin College, Kochi-2, Kerala, India
J.P.
Abraham
790031947532846009984
790031947532846009984
No
Department of Physics, The Cochin College, Kochi-2, Kerala, India
A.G.
Umadevi
790031947532846009985
790031947532846009985
No
Department of Chemistry, NSS College, Ottapalam, Palakkad, Kerala, India
A.
Sunil
790031947532846009986
790031947532846009986
No
Department of Physics, Fatima Mata National College, Kollam, Kerala, India
P.J.
Jojo
790031947532846009987
790031947532846009987
Yes
Department of Physics, Fatima Mata National College, Kollam, Kerala, India
S.
Ben Byju
790031947532846009988
790031947532846009988
No
Department of Physics, Fatima Mata National College, Kollam, Kerala, India
S.
Radhakrishnan
790031947532846009989
790031947532846009989
No
Bhabha Atomic Research Centre, Health Physics Unit, IREL, Udyogmandal, Kerala, India
M.
Harikumar
790031947532846009990
790031947532846009990
No
Bhabha Atomic Research Centre, Health Physics Unit, IREL, Udyogmandal, Kerala, India