Exposure to radiation is one of the main sources of risk to staff employed in
reactor facilities. The staff of a tokamak is exposed to a wide range of
neutrons and photons around the tokamak hall. The International Thermonuclear
Experimental Reactor (ITER) is a nuclear fusion engineering project and the
most advanced experimental tokamak in the world. From the radiobiological
point of view, ITER dose rates assessment is particularly important. The aim
of this study is the assessment of the amount of radiation in ITER during its
normal operation in a radial direction from the plasma chamber to the tokamak
hall. To achieve this goal, the ITER system and its components were simulated
by the Monte Carlo method using the MCNPX 2.6.0 code. Furthermore, the
equivalent dose rates of some radiosensitive organs of the human body were
calculated by using the medical internal radiation dose phantom. Our study is
based on the deuterium-tritium plasma burning by 14.1 MeV neutron production
and also photon radiation due to neutron activation. As our results show, the
total equivalent dose rate on the outside of the bioshield wall of the
tokamak hall is about 1 mSv per year, which is less than the annual
occupational dose rate limit during the normal operation of ITER. Also,
equivalent dose rates of radiosensitive organs have shown that the maximum
dose rate belongs to the kidney. The data may help calculate how long the
staff can stay in such an environment, before the equivalent dose rates reach
the whole-body dose limits.
Conceptual Shield Design for Boron Neutron Capture Therapy Facility Using Monte Carlo N-Particle Extended Simulator with Kartini Research Reactor as Neutron Source
