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Measurement of Indoor and Outdoor Background Ionising Radiation Levels of Kwali General Hospital, Abuja JAMES, I.U.; MOSES, I.F.; VANDI, J.N. & IKOH, U.E. Abstract Measurement of indoor and outdoor background ionising radiation level at Kwali General Hospital, Abuja, Nigeria was carried out using a well calibrated Geiger muller counter; Atomtex AT1117M radiation monitor. The dose equivalent results obtained range from 0.100±0.001 μSv/h to 0.124±0.007 μSv/h with an average of 0.107±0.003 μSv/h for indoor measurement while it ranges from 0.100±0.001 μSv/h to 0.122±0.003 μSv/h with an average of 0.108±0.003 μSv/h for outdoor measurement respectively. The obtained values are below the standard background radiation of 0.133 μSv/h. The study also revealed that the average annual equivalent dose rate is 0.750± 0.020 mSv/y and 0.189±0.005 mSv/y for indoor and outdoor measurements respectively. These results revealed that the dose levels in all of the locations (indoor and outdoor) were below the 1 mSv/y maximum permissible limit for the public set by International Commission on Radiological Protection (ICRP). Therefore, Kwali General Hospital is radiologically safe. Keywords Background ionising radiation; Geiger muller counter; radiation monitor; equivalent dose; indoor and outdoor measurement

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