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Evaluation of environmental natural radioactivity levels in soil and ground water of Barkin Ladi, Plateau state, Nigeria

Abba, Habu Tela and Wan Hassan, Wan Muhamad Saridan and Saleh, Muneer Aziz (2018) Evaluation of environmental natural radioactivity levels in soil and ground water of Barkin Ladi, Plateau state, Nigeria. Malaysian Journal of Fundamental and Applied Sciences, 14 (3). pp. 338-342. ISSN 2289-5981

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Official URL: https://doi.org/10.11113/mjfas.v14n3.882

Abstract

Gamma spectrometry was used to measure gamma dose rate in air and to determine the activity concentration of naturally occurring radionuclides viz. 226Ra 232Th and 40K in soil samples collected across the geological formations of Barkin Ladi. Dose rates measured in-situ ranged from 5 nGy h−1 to 1265 nGy h−1 with a mean value of 325 nGy h−1. The activity concentrations of 226Ra ranged from 27 to 327 Bq kg−1, 34 to 457 Bq kg−1 for 232Th and 43 to 1055 Bq kg−1 for 40K. Their mean values are significantly higher than their corresponding global average values. Annual effective dose due to exposure to gamma dose is calculated at 0.34 mSv y−1. Mass concentrations of uranium (238U) and thorium (232Th) determined in groundwater samples using Inductive Coupled Plasma Mass Spectrometry (ICP-MS) ranged from 2.5 to 35 μg l−1 for 238U and 0.5 to 15 μg l−1 for 232Th. Ingestion effective dose varies between 10.5 and 142 mSv y−1 for 238U and between 0.34 and 10.2 mSv y−1 for 232Th. Mass concentration of three water samples exceed the toxicity limit of U in groundwater provided by WHO. The result revealed that human risk due to ingestion of groundwater is from chemical toxicity rather than radiological effects. The results of this work will be useful for radio-geochemical investigation and groundwater resources management.

Item Type:Article
Uncontrolled Keywords:radioactivity, geological unit
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:84257
Deposited By: Siti Nor Hashidah Zakaria
Deposited On:16 Dec 2019 11:22
Last Modified:16 Dec 2019 11:22

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