Find the thickness of aluminium layer which reduces by half the intensity of a narrow monochroma...

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Find the thickness of aluminium layer which reduces by half the intensity of a narrow monochromatic \( \mathrm{X} \)-ray beam if the corresponding mass absorption coefficient is \( \mu / \rho=0.32 \mathrm{~cm}^{2} / \mathrm{g} \).
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