AbstractThe cross section for the reaction 35-h Rh105(n,γ)30-sec Rh106has been measured using a TRIGA reactor in the pulsed mode of operation as a neutron source. The effective thermal-neutron (0 to 0.5 eV) cross section was found to be 13 300±1 500 b, relative to a 36-b cross section for Co59. The cadmium ratio was observed to be≥20 in a neutron flux for which a cadmium ratio of 7 was measured for cobalt.