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Calculating the indoor dose deposited by γ-photons using GEANT4

The GEANT4 package programs were used to calculate the contribution of external γ dose due to natural radioactivity of building materials. The method correlates the activity concentrations of 40K and members of the 238U and 232Th radioactive decay chains in building materials used for constructing the walls with the γ dose absorbed by a water phantom at the center of the room. The obtained results are in agreement with values measured and calculated by other authors.