One half the rays from 99m Tc are absorbed by a 0.170-mm-thick lead shielding. Half of

Question:

One half the γ rays from ^99mTc are absorbed by a 0.170-mm-thick lead shielding. Half of the γ rays that pass through the first layer of lead are absorbed in a second layer of equal thickness. What thickness of lead will absorb all but one in 1000 of these γ rays?

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