Determination of Absorbed and Effective Dose from Natural Background Radiation around a Nuclear Research Facility
Muhammad Auwal Musa, Idris Isa Funtua, Simon Peter Malam and Abdullahi Suleiman Arabi
DOI : 10.3844/ajessp.2011.173.177
American Journal of Environmental Sciences
Volume 7, Issue 2
Problem statement: 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. Approach: A high-resolution in situ γ-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. Results: 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.Conclusions: 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 does not appear to have any impact on the radiation burden of the environment.
© 2011 Muhammad Auwal Musa, Idris Isa Funtua, Simon Peter Malam and Abdullahi Suleiman Arabi. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.