The use of K_e,0factors as a tool for a critical evaluation of reactor thermal and epithermal (n,γ) cross-sections and of absolute gamma intensities

Abstract

By comparison of experimental Ke,0 factors, determined in reactor positions with greatly different thermal-to-epithermal neutron flux ratios, with theoretically calculated Ke,0 factors, it is possible in some cases to select the best values from literature data for (n, gamma ) activation cross-sections and for absolute gamma intensities. Twenty different isotopes were considered.

Determination of Neutron Fluxes and Spectrum Shaping Factors in Irradiation Sites of Ghana’S Miniature Neutron Source Reactor (mnsr) by Activation Method After Compensation of Loss of Excess Reactivty

“…For the non-ideal conditions I o (α) values ought to be used instead of I o . The conversion of I o to α-dependent terms takes the form [9]:…”

“…The activity ratio for an infinitely thin gold foil or alloy irradiated with and without cadmium covers (Cadmium ratio method) is used [12] for measuring epithermal flux-shaping factor and thermal to epithermal flux ratio. This method is also used as a calibration standard to measure the resonance integrals for (n, γ) reactions [9].…”

“…The Neutron Shaping Factor (α) at the outer and inner irradiation sites, 7 and 2, respectively were calculated using Equations (9) and (17) together with a computer program written in Fortran 90 to solve for the shaping factor (α) using Equation (9). The shaping factors (α) were deduced relative to the ratio of resonance to averaged cross section data, Qo.…”