Speaker
Summary
Radioisotopes for radiopharmaceuticals are produced in medical cyclotrons through various nuclear reactions. Secondary neutrons, produced mainly by the (p,n) reactions, cause the activation of medical cyclotrons; therefore, an accurate simulation is necessary to evaluate the radionuclide inventory in activated wastes for decommissioning. However, the 18O(p,n)18F reaction typically relies on the physics model in Monte Carlo (MC) codes. Accordingly, the characteristics of secondary neutrons were compared between the MC codes, MCNP and PHITS.
As a results, the simulations showed that, at backward angles, neutron energies decreased, and the discrepancies compared to the experimental data increased. So the difference of radionuclide inventory will become more pronounced; therefore, further work is needed to develop and validate more accurate source terms.
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