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Top: delayed gamma fraction determined for a set of fits with the signal normalization set between the stabilization of the reactor power tStab and the insertion of the cadmium blade tSCRAM, using either BF3 detector as neutron signal reference. A build-up of the delayed gamma signal can be seen – presenting here as an exponential reduction in delayed gamma fraction. After about 8 min a saturation of build-up is seen. Bottom: by using the fitted exponential decay, we used the arbitrary threshold of having observed 95% of the fitted decay we determine the respective delayed neutron fraction estimate by estimating the mean and standard deviation of all accepted samples.
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