Computational analysis of the dose rates at JSI TRIGA reactor irradiation facilities

The JSI TRIGA Mark II, IJS research reactor is equipped with numerous irradiation positions, where samples can be irradiated by neutrons and gamma-rays. Irradiation position selection is based on its properties, such as physical size and accessibility, as well as neutron and gamma-ray spectra, flux and dose intensities. This paper presents an overview on the neutron and gamma-ray fluxes, spectra and dose intensities calculations using Monte Carlo MCNP software and ENDF/B-VII.0 nuclear data libraries. The dose-rates are presented in terms of ambient dose equivalents, air kerma, and silicon dose equivalent. At full reactor power the neutron ambient dose equivalent ranges from 5.5 x 10(3)Sv h(-1) to 6 x 10(6)Svh(-1), silicon dose equivalent from 6 x 10(2)Gy/h(si) to 3 x 10(5)Gy/h(si), and neutron air kerma from 4.3 x 10(3)Gy h(-1) to 2 x 10(5)Gy h(-1) Ratio of fast (1 MeV < E) vs. thermal neutrons (E < 0.625 eV) ranges from 1.5 to 8.4 x 10(-2), gamma ray ambient dose equivalent at full reactor power from 3.4 x 10(3)Sy h(-1) to 3.6 x 10(5)Sv h(-1) and gamma air kerma range 3.1 x 10(3)Gy h(-1) to 2.9 x 10(5)Gy h(-1).