(Answered) Mass-attenuation coefficient of aluminium al and lead pbin

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Mass-attenuation coefficient of aluminium (Al) and lead (Pb)in 300 keV is 1.042E-01 and 4.031E-01, respectively. The material density of Al and Pb is 2.7 and 11.35 g/cm^3, respectively.

(a) What thickness of Al and Pb are needed to reduce the number of 300 keV photons in a narrow beam to one-fourth the incident number?

(b) Compare the thickness in cm and g/cm^2

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