Abstract
This study presents result of outdoor absorbed dose rate and estimated effective dose from the naturally occurring radionuclides 232Th and 238U series 40K, around a Nuclear Research Reactor at the Centre for Energy Research and Training (CERT), Zaria, Nigeria. A high-resolution in situ -ray spectrometry was used to carry out the study. CERT houses a 30Kw Research Reactor and other neutron and gamma sources for Research and Training. The values of absorbed dose rate in air for 232Th, 238U and 40K range from 8.2±2.5-24.5±3.6 nGy h 1, 1.9±1.2-4.6±2.5 nGy h 1 and 12.2 ±5-38±6.7n Gy h 1 respectively . The estimated total annual effective dose outdoor for the sites range from 27.3-79.9 µSv y 1. This showed that radiation exposure level for the public is lower than the recommended value of 1 mSv y 1.Hence, the extensive usage of radioactive materials within and around CERT
Highlights
The presence of Naturally Occurring Radionuclides (NORs) in the Earth’s crust is well known
The principal aim of this study is to develop a other locations at selected settlements around Centre for Energy Research and Training (CERT)
The corresponding worldwide average values range from 18-93 nGy h−1 and the population-weighted values gave an average absorbed dose rate in air outdoors from terrestrial gamma radiation as 60 nGy h−1
Summary
The presence of Naturally Occurring Radionuclides (NORs) in the Earth’s crust is well known. External exposures to gamma radiation outdoors arise from terrestrial radionuclides occurring at trace levels in all rock formations. Of terrestrial outdoor gamma dose rates levels in 11°09.790’ N within the Zaria sheet 102.
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