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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. 6.93 mm

b. 0.12 mm^-1

c. 0.277 mm^-1

d. 3.01 mm

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