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A point source that emits beta particles at a rate of 107/s is to be shielded....

A point source that emits beta particles at a rate of 107/s is to be shielded. If the max beta energy is 3.0 MeV, what thickness of aluminum would be required to attenuate the beta particles, and what thickness of lead would need to be included to reduce the photon flux at 50 cm by a factor of 1000?

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