Abstract
A radon survey was carried out in some nursery and primary schools located in Ibadan-North Local Government of Oyo State, Nigeria. Radon concentration was measured using passive diffusion cup technique fitted with CR-39 detectors. The detectors were exposed for a period of 90 days in different locations inside the school buildings: classrooms and offices. After this period, the detectors were etched with 6.25M NaOH at 90 °C for 3 h. The tracks were counted and captured using a digital camera connected to a microscope and a laptop with the aid of VIMCRO USB software. The arithmetic mean of radon concentration in the studied area was 176.15 Bq/m3 and the mean annual effective dose to the lung was found to be 1.14 mSvy−1. These mean values of radon levels are considered safe while comparing with the upper reference level of 1000 Bq/m3, the action level recommended for workplaces by The International Commission on Radiological Protection (ICRP, 2014).
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