Epithermal index inside the P Moata Reactor Facility

The epithermal index, r√T/To was measured inside the P' Moata reactor facility by using resonance detector, Au197, W186, In115, and Mn55: Moata is 10KW, Argonaut type reactor, with 1,5 x 1011 n cm-2 sek-1 thermal flux, installed in Lucas Heights, Sydney, owned by the Australian Atomic Energy Commission. The neutron spectrum was assumed to consist of Maxwellian diatribution to which it smoothly joined 1/E slowing down spectrum. By measuring the cadmium ratio (Rsub(c,d)) for each foils, the epithermal index value was then calculated from the following equation r√T/To = Gsub(th)/(FRsub(cd)-.1)Ssub(o)Gsub(r)/g+Rsub(c,d)(1/K - W).Cadmium ratio for foil was measured using a cadmium box of 0,5 inches diameter and 0,015 inches thick. (author)