During the deep X-ray therapy high energy X-rays are used. They are filtered by passing them through copper and aluminiu

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During the deep X-ray therapy high energy X-rays are used. Theyare filtered by passing themthrough copper and aluminium plates. If the copper plate hasthickness 𝑑1 = 1 mm and aluminium plate 𝑑2 = 5 mm, find reductionin X-ray beam intensity. Linear attenuation coefficients for copperand aluminium are 𝜇1 = 0,32 cm –1, and 𝜇2 = 0,15 cm –1,respectively.