Radiometric evaluation of excessive lifetime cancer probability due to naturally occurring radionuclides in wastes dumpsites soils in Agbara, Southwest, Nigeria

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Abstract

The concentration and spatial distribution of the gamma ray emitting 238U, 232Th, 40K and 137Cs radionuclides in dumpsite soils in Agbara were analyzed with the aim of evaluating the radiation hazards and excessive lifetime cancer risk using well calibrated HPGe c-ray spectrometry technique. The ranges of activity concentrations of 238U, 232Th, 40K and 137Cs are 11.5 ± 1.0 M 166 ± 40 Bq kg1, 15.6 ± 1.8 M 31.4 ± 2.3 Bq kg1, 20.4 ± 1.3 M 366 ± 30 Bq kg1
and 0.52 ± 0.1 M 8.44 ± 0.2 Bq kg1 respectively. Radiological parameters such as absorbed doserate, radium equivalent, annual effective dose equivalent, internal and external hazard indices,gamma level index, activity utilization index, annual genetic significant dose equivalent, exposurerate and excessive lifetime cancer risk were calculated to know the complete radiological hazardous
nature of the dumpsite soils to the inhabitants of the sites. The calculated radiological parameters were higher than the world average value in two of the sampling points. The ratio of the detected radioisotopes was calculated for spatial distribution of natural radionuclides in the study area. RESRAD computer code was applied to calculate the total effective dose equivalent (TEDE).
The code was also used to calculate the probability of excess lifetime cancer incurred by dwellers/inhabitants of the dumpsites, the level of which was determined to be 0.5 104 and 2.5 105 for Idowale and Ibijola dumpsite soils over a period of 30 years respectively. Therefore, the radiological risks to the general populations from waste enhanced naturally occurring radioactive materials (WENORM) from the Idowale dumpsite top soils are considered to be significant.
Original languageEnglish
Pages (from-to)315-324
Number of pages10
JournalJournal of the Association of Arab Universities for Basic and Applied Sciences
Volume24
DOIs
Publication statusPublished - 16 Jun 2017

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