For "\\gamma" rays
"I=I_0e^{-\\mu x}"
In our case
"0.8I_0=I_0e^{-\\mu\\cdot 0.002} \\to \\mu=111.57 m^{-1}"
So,
"0.3I_0=I_0e^{-111.57\\cdot x} \\to x=111.57 m^{-1}\\approx0.011m"
"n=\\frac{0.011}{0.002}=5.5\\approx6"
6 plates are required.
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