The intensity of gamma radiation from a given source is I. On passing through \( 36 \mathrm{~mm}...

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The intensity of gamma radiation from a given source is I. On passing through \( 36 \mathrm{~mm} \) of lead, it is reduced to \( 1 / 8 \). The thickness of lead, which will reduce the intensity to \( 1 / 2 \) will be :
(A) \( 6 \mathrm{~mm} \)
(B) \( 9 \mathrm{~mm} \)
(C) \( 18 \mathrm{~mm} \)
(D) \( 12 \mathrm{~mm} \)
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