International Journal of Radiation Research
نشریه پرتو پژوه
Int J Radiat Res
Basic Sciences
http://ijrr.com
79
journal79
2322-3243
2345-4229
10.61186/ijrr
en
jalali
1398
3
1
gregorian
2019
6
1
17
3
online
1
fulltext
en
Evaluation of radon exhalation rate and excessive lifetime cancer risk in Dumpsites in Ondo city Southwestern Nigeria
Radiation Biology
Radiation Biology
تحقيق بديع
Original Research
<div style="text-align: justify;">Background: Ondo city in Ondo State Nigeria includes Ondo East and West could be described as a research city due to antecedent number of research institutes. Materials and Methods: Dose due to radioactivity content of soil samples from sixteen waste dump sites in Ondo, Southwestern Nigeria was determined using gamma-ray spectrometer in order to evaluate the radiation hazard health profile and excess lifetime cancer risk ELCR. Results: The weighted average value of radon emanation coefficient, mass exhalation rate, concentration in soil gas and surface exhalation rate were 10.5%, 15.2 µBq kg<sup>-1</sup> s<sup>-1</sup>, 2.2 kBq m<sup>-3</sup> and 18.8 mBq m<sup>-1</sup>s<sup>-1</sup>. The weighted mean concentrations obtained were 354 ± 53, 58±14 and 23 ± 2Bq kg<sup>-1</sup> for <sup>40</sup>K, <sup>226</sup>Ra and <sup>232</sup>Th respectively. Radium equivalent activity (119.11Bq kg<sup>-1</sup>), Outdoor external dose (54.26 nGy h<sup>-1</sup>), Indoor external dose (107.04 nGy h<sup>-1</sup>), and total average annual effective dose (0.59 mSv y<sup>-1</sup>) were obtained. From the measured γ-rays spectra, elemental concentrations were determined for <sup>232</sup>Th (mean 5.8ppm), <sup>226</sup>Ra (mean 4.8ppm) and <sup>40</sup>K (mean 1.1 %). Thorium was lower than world average 7.4ppm by a factor of 1.3; radium was higher than the world average (2.8 ppm) by factor 1.7 while potassium was relatively equal to world average (1.3 %). Conclusion: The total excess lifetime cancer risk ELCR was found to be 1.95 x 10<sup>-3 </sup>which was slightly higher than the world average. In addition, a good correlation was found between the radium concentration and radon exhalation rate in the area.</div>
Activity concentration, dose, dumpsites, excess lifetime cancer risk ELCR, radon parameters.
379
390
http://ijrr.com/browse.php?a_code=A-10-1-794&slc_lang=en&sid=1
E.B.
Faweya
febdeprof@yahoo.co.uk
7900319475328460014260
7900319475328460014260
Yes
Department of Physics, Faculty of Science, Ekiti State University, Nigeria
G.O.
Olowomofe
7900319475328460014261
7900319475328460014261
No
Department of Physics, Faculty of Science, Ekiti State University, Nigeria
H.T.
Akande
7900319475328460014262
7900319475328460014262
No
Department of Physics, Faculty of Science, Ekiti State University, Nigeria
O.
Faweya
7900319475328460014263
7900319475328460014263
No
Department of Statistics, Faculty of Science, Ekiti State University, Nigeria
G.E.
Adesakin
7900319475328460014264
7900319475328460014264
No
Department of Physics, Faculty of Science, Ekiti State University, Nigeria