(ii) A solution containing such phosphorus atoms is used in a medical procedure. When it is prepared, the solution has an activity of 1400 counts
(ii) A solution containing such phosphorus atoms is used in a medical procedure. When it is prepared, the solution has an activity of 1400 counts per second. The solution cannot be used when its activity falls below 350 counts per second, Calculate the maximum time between preparing and using the solution. [2 mks]
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