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Comparison of Activity and Power Measurements of a 1 Ci 60Co Source

The results of the activity measurement of a 1 Ci 60Co source made at the Bureau International des Poids et Mesures are compared to those of the power measurement of a similar 60Co source performed at the National Bureau of Standards. For this comparison, the ratio of the activities of the two sources is determined; the method used is described and the errors analysed. The agreement between the activity and power measurements is excellent: the relative difference is less than 1 × 10-3, which is not significant according to the estimated errors.