Measurement and Monte Carlo simulation of γ-ray dose rate in high-exposure building materials

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Natural radioactivity radionuclides in building materials, such as~(226)Ra,~(232)Th and~(40)K, cause indoor exposure due to their gamma-rays. In this research, in a standard dwelling room(5.0 m 9 4.0 m 9 2.8 m), with the floor covered by various granite stones, was set up to simulate the dose rates from the radionuclides using MCNP4 C code. Using samples of granite building products in Iran, activities of the~(226)Ra,~(232)Th and~(40)K were measured at 3.8–94.2, 6.5–172.2 and 556.9–1529.2 Bq kg~(-1),respectively. The simulated dose rates were26.31–184.36 n Gy h~(-1), while the measured dose rates were 27.70–204.17 n Gy h~(-1). With the results in good agreement, the simulation is suitable for any kind of dwelling places. In this research, in a standard dwelling room (5.0 m 9 (K)), this radioactive radionuclides in building materials, such as ~ (226) Ra, ~ (232) Th and ~ 4.0 m 9 2.8 m), with the floor covered by various granite stones, was set up to simulate the dose rates from the radionuclides using MCNP4 C code. Using samples of granite building products in Iran, activities of the (226) Ra, The calculated dose rates of 26 and 81 K were measured at 3.8-94.2, 6.5-172.2 and 556.9-1529.2 Bq kg -1, respectively. 1), while the measured dose rates were 27.70-204.17 n Gyh ~ (-1). With the results in good agreement, the simulation is suitable for any kind of dwelling places.
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