One half the yrays from 99m Tcare absorbed by a 0.170-mm-thicklead shielding. Half of the y 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 yrays?
One half the yrays from 99m Tcare absorbed by a 0.170-mm-thicklead shielding. Half of the y 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 yrays?
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Transcribed Image Text:One half the yrays from 99m Tcare absorbed by a 0.170-mm-thicklead shielding.
Half of the y 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 yrays?
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