Open AccessEvaluation of background radiation of Maryland School complex, Lagos, Nigeria
Author(s) -
Ruth Omoseeke Morakinyo,
M.R. Usikalu,
Muyiwa Michael Orosun
Publication year - 2022
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/993/1/012015
Subject(s) - radionuclide , equivalent dose , radium , radiological weapon , nuclear medicine , ionizing radiation , effective dose (radiation) , dose rate , absorbed dose rate , background radiation , environmental science , toxicology , medicine , radiochemistry , absorbed dose , radiation , dosimetry , physics , chemistry , irradiation , nuclear physics , biology
The background radiation of Maryland School Complex was taken using RS-125 hand-held gamma spectrometer. The average concentration of the measured radionuclides were 19.16, 46.14, 165.00 Bq/kg for 238 U, 232 Thand 40 K, respectively. The average value of measured dose rate and the estimated dose rate were 44.93 and 43.55Bq/kg. The mean values of the estimated radiological parameter were 53.45, 213.78μSv/y for indoor and outdoor annual effective dose. The excess lifetime cancer risk averaged 0.17, the hazard indices were 0.26 and 0.32 for external and internal respectively. The annual gonadal dose and radium equivalent were 303.90 μSv/y and 97.85 Bq/kg, while the gamma representative index was 0.69. The mean concentration of radionuclides measured and the estimated radiological parameter were within the recommended values. This therefore follows that the risk of exposure to ionizing radiation for both the staff and the students of the community is within acceptable limits.