The count rate for a particular a source X is C0 on a detector placed 1 m from the source. When a metal sheet of thickness 5mm is placed between source and counter the count rate drops by 75%. What is the value of the attenuation coefficient, μ, for this radiation and metal? Select one: a. 0.12 mm-1 b. 0.277 mm-1 c. 3.01 mm d. 6.93 mm

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