In this study, radon concentration was measured with an active detector (RAD 7) in the Science Faculty building complex basement of a tertiary institution in South West (SW), Nigeria. The attendant risk descriptors were determined with the help of mathematical models. The range of mean detectable radon concentration in the basement is 26.5 ±12.3 – 242 ± 50.7 Bq m-3 and the mean for all the rooms examined is 61.74 ± 58.48 Bq m-3. The overall mean is less than the global mean of 100 Bq m-3. The mean annual dose rate is found to be 0.97 ± 0.92 mSv y-1.  The mean annual effective doses for different subjects examined are 0.412 ± 0.391 mSv y-1 (worker), 0.0221 ± 0.0209 mSv y-1 (student in lab session), 0.515 ± 0.488 mSv y-1 (student who lives in the hostel) and 2.149 ± 2.036 mSv y-1 (home owner). Students and workers in the basement are not likely to develop serious health effects, however, if the basement is used as a living room, the radon concentration in Room I-R might lead to health effects. The range of calculated excess life cancer risks (ELCRs) are (0.64-5.82) x 10-3 and (1.16 -10.58) x 10-3 for student and homeowner respectively. The mean values for the two subjects examined fall below the maximum risk of 3.5 x 10-3.

A certain degree of solar light illuminance could prevent myopia in children. However, UV radiation (UVR) serves as mutagen and a non-specific damaging agent. Ultraviolet radiation can initiates and promote tumor growth, essentially under the skin. To this end, this study was designed to assess daily and annual UVR exposures of outdoor workers (OWs) in Southwestern Nigeria by using standard methods. Results obtained show that the mean daily and annual UV exposure were found to be 1.23 mW/cm2 and 319.8 mW/cm2 respectively. The mean predictive protection factor (PPF) for glass, trampoline and neem shade were found to be 43.84%, 98.69 % and 92.88 % respectively. This indicates that trampoline used to build tent has the greatest PPF followed by the shade of a neem tree. Results of this study also show that peak UVR exposures occur between 1400 and 1600 hours. Based on the findings of this study, outdoor workers could prevent UVR overexposure during the peak exposure period by working under the shade of a tree or wear effective UVR shields such as trampoline hat.