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ORIGINAL ARTICLE
Year : 2014  |  Volume : 37  |  Issue : 3  |  Page : 132-142

Natural radioactivity concentrations in Alvand granitic rocks in Hamadan, Iran


1 Department of Physics, Faculty of Science, Arak University, Arak 38156, Iran
2 Department of Physics, Faculty of Science, Isfahan University, Isfahan 81746, Iran

Correspondence Address:
R Pourimani
Department of Physics, Faculty of Science, Arak University, Arak 38156
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0464.154866

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Natural radioactivity of 30 granite rock samples collected from Alvand plutonic complex was determined using a high-resolution, high purity germanium gamma-spectrometry system. The activity concentrations of 226 Ra, 232 Th and 40 K varied from 8.4 ± 0.6 to 119.3 ± 1.9, i.e., minimum detectable activities (MDA) to 268.4 ± 3.3 and 62.9 ± 4.1 to 1602.6 ± 27.9 Bq/kg, respectively. 137 Cs ranged from MDA to 4.9 ± 0.7 Bq/kg. The radium equivalent activity varies between 35.7 and 624.2 Bq/kg that is lower than the permitted value (370 Bq/kg) except in three samples. The absorbed dose rate ranged from 17.9 to 282.8 nGy/h, and the effective dose rate outdoor was determined to be between 21.9 and 347.0 μSv/y. The annual effective dose rate indoor varied from 87.8 to 1388.2 μSv/y that is lower than the dose criterion, 1 mSv/y, except for PGG(W) and GRG(W) samples. The internal and external hazard indices values range from 0.1-2.0 to 0.1-1.7, respectively, only four out of 30 showed values higher than unity.


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