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The HVLs of lead for 140-keV and 511 keV y-rays are 0.17 mm and 4 mm, respectively. To have the same percentage of transmission through

The HVLs of lead for 140-keV and 511 keV y-rays are 0.17 mm and 4 mm, respectively. To have the same percentage of transmission through lead septa for the two cases, what is the ratio of the thickness of lead septa used for 511 keV y-rays and 140-keV y-rays? What are the thicknesses of lead septa in order to block 90% of the y-rays in these two cases?

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