Calculation of neutron/gamma dose rates’ distributions inside TRR neutron diffraction facility laboratory using computational method

Neutron scattering facilities are widely applied to study the properties of materials. A beam of monochomatic neutrons or a widespread wavelength band of neutrons is used to irradiate the sample which is going to be analyzed at the scattering laboratory. Shielding of incident neutrons also the scattered ones from the sample should be definitely done to decrease the laboratory dose rates. Also, mapping of the dose rate distributions helps to the laboratory users to avoid high neutron/gamma exposures. The present study uses a computational method to simulate neutron and gamma dose rates’ distributions inside TRR diffraction facility laboratory. Not only the simulation method helps to design the laboratory boundary or the laboratory walls so that behind its walls the personal exposures remain as low as possible, but also gives warnings to the facility users about the high dose regions around the beam exit when the facility is under operation. The carried-out work showed after the laboratory boundary, summation of the neutron and gamma dose rates are less than ۳ μSv.h-۱. In addition, the carried-out benchmark studies by using experimental data in this work confirms the simulations with less than ۲۰% relative discrepancy.

کلیدواژه ها:

Neutron dose rate ، Gamma dose rate ، Diffraction laboratory ، MCNPX code