Measurements of the Neutron Spectrum Energy in the IPEN/MB-01 Reactor Core

摘要

This work presents the results of neutron spectrum measurements at central position of the IPEN/MB-01reactor core. For this purpose has been used several activation foils (Au, Sc, U, Mg, Ti, Ni, and In Foils) thathave been irradiated at central position of the reactor core (standard rectangular configuration 28 x 26 fuel rods)in the maximum power level (100 watts). After this one the foils were counting at HPGe solid state detector(gamma spectrometry). The nuclear reaction rates experimental results (saturated activity per target nucleus) istogether with an initial approach to the neutron reactor spectrum (estimated by reactor physics cellular codes) themain data to obtain the most appropriated neutron spectrum at the irradiation position by interactive adjustmentprocess using the unfolding SANDBP code. The results obtained were (5.1312±0.1609).10 n/cm2.s to theintegral neutron flux, (9.8087±0.4974).108 n/cm2 to the thermal neutron flux, (3.2272 ± 0.4378).10 n/cm2.sto the intermediate neutron flux and (1.9040 ± 0.6390).10 n/cm2.s to the fast neutron flux. These results areimportant and may be used to check and validate reactor physics codes and several nuclear data libraries.