During the deep X-ray therapy high energy X-rays are used. They are filtered by passing them through copper and aluminium plates. If the copper plate has thickness ?1 = 2 mm and aluminium plate ?2 = 6 mm, find reduction in X-ray beam intensity. Linear attenuation coefficients for copper and aluminium are ?1 = 0,32 cm –1, and ?2 = 0,15 cm –1, respectively.

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1. During the deep X-ray therapy high energy X-rays are used. They are filtered by passing them through copper and aluminium plates. If the copper plate has thickness ?1 = 2 mm and aluminium plate ?2 = 6 mm, find
reduction in X-ray beam intensity. Linear attenuation coefficients for copper and aluminium are ?1 = 0,32 cm –1, and ?2 = 0,15 cm –1, respectively.

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