Self-powered detectors have been developed with bismuth (2mm diameter × 6.4mm) and platinum (2mm diameter×5mm) emitters. Tests at a 60Co irradiation facility in 0.125MR/h (484.5MC/kg/h) gamma field showed that the gamma sensitivity of the two detectors is 0.121fA/R/h (0.468pA/C/kg/h) and 0.17fA/R/h (0.658pA/C/kg/h). When tested in the core location in Apsara Swimming Pool reactor the current from Bi detector was assumed to be totally gamma-induced. This information was used to derive the neutron-induced component of the Pt detector in which55% of the total signal was gamma-induced. The neutron sensitivity was found to be 0.54×10–21A/nv.