The single comparator method has been extended to a triple comparator method, using60Co,114mIn and198Au. In this technique, thek-ratios of the elements to be analyzed, now determined against the three comparators, are corrected for each new ratio of
thermal to epithermal reactor neutron flux. These flux ratios are calculated from the absolute activities of the three comparators.
The thermal neutron activation cross-section and the resonance integral for the reaction113In(n,γ)114mIn have been determined.