FINAL RESULTS OF THE CADMIUM AND SPECTRAL RATIOS OBTAINED INSIDE OF THE FUEL ROD POSITIONED IN THE CENTRAL POSITION OF THE IPEN/MB-01 NUCLEAR REACTOR

摘要

The spectral ratios are very important to determine some nuclear reactors parameters such as reaction rates, fuel lifetime, etc and some safety operational conditions. This study aims to determine the spectral ratios in 2 (two) spacial positions located inside the core of the Nuclear Reactor IPEN/MB-01. These places are at the central position of the nuclear reactor core in an asymptotic neutron flux region. The experiment consists in inserting different activation foil detectors inside an experimental fuel rod. The experimental rod is assembled at the central position of the reactor core. Activation neutron foil detectors of different elements such as ~(197)Au, ~(238)U, ~(45)Sc, ~(58)Ni, ~(24)Mg, ~(47)Ti and ~(115m)In were used to cover a large range of neutron spectrum. Saturation activity per target nucleus was obtained by gamma spectrometry using a HPGe system. The experimental cadmium ratios compared with values computed by MCNP-4C code show good agreement.