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Reza Pourimani

Reza Pourimani

Academic rank: Professor
ORCID: https://orcid.org/0000-0002-0102-0578
Education: PhD.
ScopusId: 6505565793
Faculty: Science
Address: Arak University
Phone:

Research

Title
Natural radioactivity concentrations in Alvand granitic rocks in Hamadan, Iran
Type
JournalPaper
Keywords
Alvand, high purity germanium, natural radioactivity, plutonic rocks
Year
2014
Journal Radiation Protection and Environment
DOI
Researchers Reza Pourimani ، Raheleh Ghahri ، Mohammad Reza Zare

Abstract

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 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. 40 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. 137