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Updated: Dec 13, 2025

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
Modeling of a neutron irradiator using Monte Carlo
Raphael F G Santos1, Wilson F Rebello2, Julio J S Estrada3
1Nuclear Engineering Graduate Program, Military Institute of Engineering (IME), Praça General Tibúrcio, 80, 22290-270, Rio de Janeiro, Brazil; Nuclear Engineering Graduate Program, Federal University of Rio de Janeiro (COPPE/UFRJ), Av. Horácio Macedo, 2030, Bloco G - Sala 206 - CT, Fundão, 21941-914, Rio de Janeiro, Brazil.
Abstract:
The Nuclear Engineering Department of the Military Institute of Engineering (SE/7-IME) is designing and simulation a neutron irradiator with 1 Ci of 241Am-9Be source. The objective of this irradiator is to generate a flux of neutrons to be used in research and teaching maintaining, for purposes of radiological protection, the rate of ambient dose equivalent, H*(10), below 10 μSv/h at 30 cm from the surface. This paper presents the proposed irradiator, values of H*(10) at different distances from the irradiator and the neutron flux in different points of the beam irradiation, all calculated using the MCNPX code.
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