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7. In a nuclear accident, a lab worker receives a dose of D rads of
radiation of x rays having an RBE of 1. If instead he had been
exposed to the same amount of energy from alpha particles
having an RBE of 20, his exposure would have been (there
may be more than one correct choice)
A. D rads.
B. 20D rads. C. D rem.
D. 20D rem.

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