In-situ assessment of background gamma radiation dose levels in outdoor environment of Enugu urban areas, Enugu state, Nigeria
| Autor: | Fredrick Oghenebrorie Ugbede, Gabriel Friday Ibeh, Anita Franklin Akpolile, Chukwuka Emmanuel Mokobia |
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| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Absorbed dose Environmental health Radiation dose Hand held Environmental science 010501 environmental sciences Management Monitoring Policy and Law Radiation Dose rate 01 natural sciences Waste Management and Disposal 0105 earth and related environmental sciences |
| DOI: | 10.6084/m9.figshare.13344818.v1 |
| Popis: | In this study, in-situ measurements of absorbed dose rates of background gamma radiation in 146 outdoor locations within Enugu urban areas were carried out by means of a hand held radiation survey meter equipped with Geiger-Muller tube. In order to assess the radiological health status of the studied environment, annual effective dose (AED) and excess lifetime cancer risk (ELCR) were estimated from the measured dose rates. The measured radiation dose rates across the locations ranged from 77.21 to 180.53 nGy h−1 with a mean value of 124.92 ± 2.00 nGy h−1. The AED and ELCR values ranged from 0.09 to 0.22 mSv y−1 with overall mean of 0.15 mSv y−1 and 0.33 × 10−3 to 0.77 × 10−3 with overall mean of 0.54 × 10−3, respectively. The measured dose rates were significantly higher than world average gamma radiation dose of 59 nGy h−1 for outdoor environment. The dose rates revealed an elevated background radiation levels signifying a radiation contaminated environment. The ELCR values indicate that the accumulation of low-level radiation doses over a lifetime exposure can initiate cancer development in residents of Enugu urban areas. |
| Databáze: | OpenAIRE |
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