An assessment of radiofrequency exposure due to GSM 900 and GSM 1800 was carried out at 30
strategic locations in the University College Hospital (UCH), Ibadan with a frequency selective spectrum
analyzer (SPECTRAN HF 60105). The Spectrum analyzer was coupled to a calibrated Omnidirectional antenna
to obtain a spatial power density for each location. The mean power densities of 38.37µW/m
2
and 8.68µW/m
2
and maximum power densities of 212.40µW/m
2
and 67.40µW/m
2
were obtained for GSM 900 and GSM 1800
respectively. The standard deviation of 51.3 µW/m
2
and 14.90µW/m
2
were also obtained for GSM 900 and GSM
1800 respectively. GSM 900 and GSM 1800 respectively show compliance level of 0.0047% and 0.00075% with
the ICNIRP reference level