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Which decay is represented in Figure 7? DA alpha C] B beta minus C beta plus D gamma (c) The half-life of cobalt-60 is 5 years. A school cobalt source had an activity of 38.5 kBq in the year 2000. Estimate the activity of this source in the year 2020. 20 = 20 = activity = - q. 625 P 621 OOFRAOI 120 (3) q. 625 _ 48125 _ : kBq 11 Turn over
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