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17. Half of the gamma rays from Tc-99m are absorbed by a 170 m thick lead shielding. Half of the gamma rays that make

17. Half of the gamma rays from Tc-99m are absorbed by a 170 m thick lead shielding. Half of the gamma rays that make it through this first layer of lead are absorbed in a second layer of equal thickness. What thickness of lead will absorb 99.9% of these gamma rays?

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