Answer
$E = 0.018 \space J = 18 \space mJ$
Work Step by Step
The energy absorbed is given by mass of a person $m$ multiplied by dose given $D$
$E = mD$
$E = (75 kg) (2.4 \times 10^{-4} Gy)$
$E = 0.018 \space J = 18 \space mJ$
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