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Copper cadmium sulphide thin film was deposited onto glass (soda-lime) substrates using chemical bath deposition (CBD) technique at room temperature. Chemical, optical, structural, and microstructural features were examined via the Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), UV-Vis Spectroscopy, and High-resolution Transmission Electron Microscopy (HRTEM). FTIR revealed that the associated chemical bond was below the 900 cm-1 marks. The optical band-gap of 2.36 eV was estimated from the absorption analysis. X-ray diffraction measurements reveal that the deposited material is polycrystalline with hexagonal and cubic structures typical of the binary constituents of and thin films. The grain sizes were randomly distributed and ranged between 35 and 60 nm as indicated by the HRTEM.

Natural radionuclides content of 238U, 232Th and 40Kfor water and sediment samples collected from Asa-dam Ilonn. Nigeria weremeasured using Nal(TI) detector. The mean activity concentration in the water samples were 6.05, 3.23 and 9.65 Bql−1 for 238U, 232Th and 40Krespectively. The mean activity concentration of 238U, 232Th and 40Kmeasured in the sediment samples were 7.57, 8.19 and 73.48 Bql−1 respectively. Theactivity concentration of 40Kwas higher than that of 238U and 232Thfor the water and sediment samples. All measured activity concentration and estimated radiological parameters were below world permissible limit values. Therefore, there may be no serious immediate radiological health burden on the environment and the people using the dam.

Radon monitoring is essential in determining the actual level of exposure in buildings. Of all the reviewed works on indoor radon level, little to none was done on comparative radon concentration study of different building structures in the study area. A comparative study of the indoor radon concentration of different building types; such as glass house, bricks and basement house structures were done to evaluate sustainable radon level using radon detector (RAD7) machine. The mean radon concentration for glass house, brick house and basement house are 14.96, 10.74 and 144.61 Bqm −3 , respectively. Glass house radon concentration range is from 11.03 to 17.46 Bqm −3 . The radon concentration measured ranged from 6.62 to 20.85 Bqm −3 for bricks house structure. Basement structure radon concentration ranges from 15.75 to 614.52 Bqm −3 . It was observed from the study that the mean radon concentration measured from the basement structure was above the recommended limit by a factor of 4. The estimated annual effective doses are 0.377, 0.271 and 3.644 mSvy −1 for glass, brick and basement houses, respectively. The study concluded that possible health risk is associated to basement structure that has limited ventilation than glass and bricks house with easy access to natural ventilation outlet. It is therefore recommended that adequate ventilation be put in place in basement house.