The solution of problem 4.53 cr 4 from Prokofiev´s prob

The solution of problem 4.53 cr 4 from Prokofiev´s prob

Task 4.53
How many times will the intensity of radiation of gamma-photons with energy of 2 MeV change during the passage
Screen, consisting of two plates: lead 2 cm thick and aluminum, 5 cm thick?

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