Activation of Co released by in-core and ex-core sources

A methodology was developed for explicitly calculating the amount of 60Co generated in a neutron flux given release rates of 59Co from both in-core and ex-core sources. The approach permits calculation of an enhancement factor which is a measure of the larger 60Co inventory that arises when the two types of sources release 59Co at the same rate. The enhancement factor depends significantly on the value chosen as the core residence time for 59Co released from ex-core sources.