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Kr-85 source used in paper company had an activity of 18.5 GBq as of January 15,...

Kr-85 source used in paper company had an activity of 18.5 GBq as of January 15, 2007. What will be its activity on Dec 15, 2010 when T(1/2) or half-life = 10.7 yrs?
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Answer #1

Initial activity Ao=18.5 GB g = 18.5x109 Bq T112= 10.7yrs time t= (Dec 15, 2010 )-(January 15, 2007) = 2.9 yos Required activ

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