Event Title

Modeling and Simulation of Radiation Doses and Nuclide Distributions in the Mu2e Experimental Hall with MARS15

Session Number

R08

Advisor(s)

Vitaly Pronskikh, Fermi National Accelerator Laboratory

Location

B-133

Start Date

28-4-2016 10:15 AM

End Date

28-4-2016 10:40 AM

Disciplines

Physics

Abstract

Mu2e is an experiment at Fermilab that will investigate the neutrino-less conversion of muons to electrons. The necessary muons will be generated by a relativistic proton beam hitting a tungsten target, which is expected to result in radiological hazards in the experimental hall. To model the emission of radioactive particles, we developed an algorithm in C++ as an extension to MARS15, a Monte Carlo code system that can simulate transport and interactions of particles. The algorithm is split into two stages. In the first stage, MARS15 generates nuclide inventories for regions in the model of the experimental hall. In the second stage, the Decay and Transmutation add-on to MARS15 adjusts these inventories for radioactive decay, and the resultant inventories are used to simulate the emission of gamma rays from regions in the model. Our results showed that the radiation levels in the remote handling room are only slightly above natural background levels, while those between the Production Solenoid and beam dump ranged from 100 to 10000 millirem per hour. Our algorithm may be adopted as a standard feature of MARS15 and assist other users in calculating residual doses in models of experiments in particle physics.


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Apr 28th, 10:15 AM Apr 28th, 10:40 AM

Modeling and Simulation of Radiation Doses and Nuclide Distributions in the Mu2e Experimental Hall with MARS15

B-133

Mu2e is an experiment at Fermilab that will investigate the neutrino-less conversion of muons to electrons. The necessary muons will be generated by a relativistic proton beam hitting a tungsten target, which is expected to result in radiological hazards in the experimental hall. To model the emission of radioactive particles, we developed an algorithm in C++ as an extension to MARS15, a Monte Carlo code system that can simulate transport and interactions of particles. The algorithm is split into two stages. In the first stage, MARS15 generates nuclide inventories for regions in the model of the experimental hall. In the second stage, the Decay and Transmutation add-on to MARS15 adjusts these inventories for radioactive decay, and the resultant inventories are used to simulate the emission of gamma rays from regions in the model. Our results showed that the radiation levels in the remote handling room are only slightly above natural background levels, while those between the Production Solenoid and beam dump ranged from 100 to 10000 millirem per hour. Our algorithm may be adopted as a standard feature of MARS15 and assist other users in calculating residual doses in models of experiments in particle physics.