Assessment of Radioactivity Levels in Soil of Koya District in Kurdistan Region-Iraq Using High-purity Germanium Detector
DOI:
https://doi.org/10.47011/15.3.5Keywords:
Radioactivity, Soil, Effective dose, HPGe, Hazard, Koya.Abstract
Cited by : Jordan J. Phys., 15 (3) (2022) 259-277
This study has been conducted to assess the 226Ra, 232Th, 40K and 137Cs radionuclides concentrations, through (5-10 and 15-25) cm-depth layers of the Koya district uncultivated soils, Erbil governorate, Kurdistan Region-Iraq, for 90 samples in 2018, using high-purity germanium detector (HpGe). As a result, the 5-10 cm layer concentrations have ranged from 3.8 ± 1.0 to 21.3 ± 0.3 (Bq.kg-1), 3.9 ± 0.3 to 36.2 ± 1.2 (Bq.kg-1), 95.0 ± 2.2 to 597.3 ± 8.9 (Bq.kg-1) and 0.0 to 42.7 ± 0.4 (Bq.kg-1) for 226Ra, 232Th, 40K and 137Cs, respectively. In contrast, the 15-25 cm layer activities have shown lower values, where they have ranged from 2.6 ± 0.9 to 20.1 ± 0.3 (Bq.kg-1), 3.1 ± 0.3 to 35.3 ± 1.2 (Bq.kg-1), 545.0 ± 8.1 to 92.4 ± 2.1 (Bq.kg-1) and 0.0 to 29.1 ± 0.3 (Bq.kg-1), for 226Ra, 232Th, 40K and 137Cs, respectively. Moreover, the radiological parameters; namely, indoor and outdoor gamma absorbed dose rates, annual effective dose rates and excess life time cancer risks with internal and external hazard indices, have been estimated as follows: (56.44, 29.22) (nGy.h-1),) 0.28, 0.04) (mSv.y-1), (0.97, 0.13) x 10-3, 0.20 and 0.17, respectively. Fortunately, the results correspond with internationally healthy values.
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