RADIOLOGICAL IMPACT ASSESSMENT DUE TO NATURAL RADIONUCLIDES IN THE SOILS FROM ALABATA, SOUTHWESTERN NIGERIA
DOI:
https://doi.org/10.46881/ajsn.v5i0.135Keywords:
Impact assessment, activity concentration, hazard indices, natural radionuclides, Alabata- AbeokutaAbstract
The 40 226 232 radioactivity levels of K, Ra and Th and their corresponding gamma absorbed dose rate, effective doserate, and hazard indices were determined in soil samples from a soft-sand collection field at Alabata Abeokuta for building construction purposes. Soil samples were collected randomly from twenty locations in the area and prepared for spectrometric analysis. The activity concentrations of the natural radionuclides in the samples was measured using a single crystal 51mm x 51mm NaI (Tl) detector coupled to a multichannel analyser for spectrometric analysis. The activity concentrations of the radionuclides obtained were used to determine the radiological hazard indices. The mean activity concentrations of 40K, 226Ra and 232Th -1 in the soil samples were 829.1±260.6 Bqkg , 61.7±21.7 Bqkg-1 and 50.1±16.6 Bqkg-1 respectively. The mean gamma absorbed dose rate was 71.45±15.58 nGyh-1 while -1 the mean effective dose rate was 0.09±0.02 mSvy . The mean radium equivalent, external hazard index, internal hazard index and gamma index were 197.2±36.8; 0.53±0.10, 0.70±0.14 and 0.73±0.14 respectively. The absorbed gamma and effective dose rates were 21.1% and 28.6% higher than the world average values of 59 nGyh-1 and 0.07 mSvy-1 respectively. The radiological hazard indices were lower than 1.0 world’s recommended limitReferences
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