Monte Carlo-simulation of whole-body absorbed

Abstract: Radiation protection is important when working in lab environments where radioactive sources are frequently used. Simplified geometrical models are sometimes used in literature or in education to analytically estimate the absorbed dose a human receives. This study investigates the accuracy of these models by comparing them to more advanced models and how the results differ if the dose is simulated in Geant4. Three cuboids with different shapes, and two more human-like models were used as the bodies that would receive the absorbed dose. It turned out, for such simplified cases, that the result seemed to be a factor of 1.6 - 3 times larger than the results achieved in the Geant4 simulation. This result is a consequence of the Compton scattering that occurs when the photons enter the bodies, a process which the analytical method does not account for. It also turned out that besides using a more human-like model, the closest result was given when the cuboids surface area was reduced to get a more human-like weight instead of its thickness.