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Updated: Feb 24, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
Energy distribution of the neutron flux measurements at the Chilean Reactor RECH-1 using multi-foil neutron
F Molina1, P Aguilera2, J Romero-Barrientos3
1Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, Las Condes, Santiago, Chile.
Abstract:
We present a methodology to obtain the energy distribution of the neutron flux of an experimental nuclear reactor, using multi-foil activation measurements and the Expectation Maximization unfolding algorithm, which is presented as an alternative to well known unfolding methods such as GRAVEL. Self-shielding flux corrections for energy bin groups were obtained using MCNP6 Monte Carlo simulations. We have made studies at the at the Dry Tube of RECH-1 obtaining fluxes of 1.5(4)×1013cm-2s-1 for the thermal neutron energy region, 1.9(5)×1012cm-2s-1 for the epithermal neutron energy region, and 4.3(11)×1011cm-2s-1 for the fast neutron energy region.
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