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A first comprehensive study is presented on radioactivity concentrations anddose rates in 87 commonly used materials, manufactured or imported in Cyprus,for building purposes. The natural radioactivity of K-40, Th-232, U-238 andRa-226 is determined using high-resolution gamma ray spectroscopy. Therespective dose rates and the associated radiological effect indices are alsocalculated. A comparison of the measured specific activity values with thecorresponding world average values shows that most of them are below the worldaverage activity values. The annual indoor effective dose rates received by anindividual from three measured imported granites and four measured importedceramics are found to be higher than the world upper limit value of 1 mSv y-1.Hence, these materials should have a restricted use according to theircorresponding calculated activity concentration index values and the related EC1999 guidelines.

Gamma Radiation Measurements and Dose Rates in Commonly Used Building Materials in Cyprus