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A .12 kg tumor is treate by injection of 2.6x10^13 90/39Y nuclei. Half life of 64 hours and the emitted particles have an energy of

A .12 kg tumor is treate by injection of 2.6x10^13 90/39Y nuclei. Half life of 64 hours and the emitted particles have an energy of 1.4x10^-13J. If all the energy carried by the -particles are absorbed by the tumor, what is the total dose when all of Y39 90 nuclei have decayed?

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