A sample of shale contains 0.055% 238U by weight. Calculate the number of spontaneous fissions in one day in a 106-kg pile of the shale by determining (a) the mass of 238U present, (b) the number of 238U atoms, (c) the fission activity, and finally (d) the number of fissions. The spontaneous fission activity rate of238U is 6.7 fissions/kg . s.
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