MEASUREMENTS OF THE GAMMA-ACTIVITIES OF COBALT AND OTHER NEUTRON FLUX MONITORS USING AN lONISATION CHAMBER

摘要

An apparatus which can be used to determine the absolute γ-activities of irradiated cobalt monitors (and the 60Co equivalent of the activities of other monitors) is described, and its characteristics specified. It incorporates an ionisation chamber.nBy indirectly relating the activities of the monitors to a number of 60Co primary standards, it has been shown that they can be determined absolutely with an accuracy of ± 3 per cent (2 σ) or better, if they are in the range 4 microcuries to 50 millicuries, or with an accuracy of ± 5 per cent (2 σ) if they are in the range I to 4 microcuries.nExperimental results are processed by a specially written program, called CIMCA, which has been prepared for the S2 compiler of the IBM 7030 (Stretch) computer at A.W.R.E., Aldermaston.