Radiation protection

The prediction of residual dose rates is an important task to insure proper radiation protection during maintenance and dismantling works. During the summer student program the main project was writing a technical note (TN) about a simulation of an antiproton experiment. The TN has EDMS number 2011821. In the TN, an antimatter matter collision is simulated i.e. antiprotons are impinged on a Cu sphere surrounded by three cylindrical samples of Al, In and Bi. In a thin shell around the collision the flux of protons, neutrons, π+, π− and photons are logged alongside the prompt ambient dose equivalent rate around the Cu sphere and the residual radionuclides in the samples. The radionuclide production in the samples have been calculated from the neutron flux around the target as well as directly evaluated in FLUKA using RESNUCL and decay cards. These values are within a factor of two of each other. The experiment described in the TN is performed in the Antiproton Decelerator (AD) experimental area. There are more details to take into account, such as the surroundings, beam line, etc. Here the activity of the Al, In and Bi samples are compared with the simulated ones. In addition to the antiprotons study, a benchmark of FLUKA version 2011.2x.3 for the 14th specialists’ Workshop on Shielding Aspects of Accelerators, Targets, and Irradiation Facilities (SATIF), was conducted with a specific geometry. The results are used for intercomparison with other Monte Carlo codes. Finally, the thermal neutron distribution in the CERN High energy AcceleRator Mixed field (CHARM) facility is investigated in collaboration with a radiation protection team from Japan. This is to characterize processes such as 40Ar(n,γ)41Ar.