With what energy must the radiation be given to image a bone of thick – McqOptions

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1.	With what energy must the radiation be given to image a bone of thickness 5 cm which has covering of skin of thickness of 2 cm on the both sides and the emerging intensity of the X – Ray is 200MeV. (impedance for bone = b for skin = s )
A.	2000e9b) 200e(4s + 5
B.	200e(4s + 5b)
C.	20/e
D.	2e
Answer» C. 20/e

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