Evaluation of background radiation of Maryland School complex, Lagos, Nigeria
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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 238U, 232Thand 40K, 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 e
Keywords
QC Physics