Calculate the Half-Value Thickness (In Mm) of Lead If It

Multiple Choice

Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm−¹ for x-rays of wavelength 10 × 10−¹² m.)

A) 0.24
B) 0.20
C) 0.12
D) 0.16
E) 0.18