A caesium 137 source produces an absorbed radiation dose of 400 milligray/ hour at a distance of 1 metre. What would be the dose received at a distance of 5 metres in two and a half hours? (consider the effect of distance first)
belongs to book: Examination Questions and Answers in Basic Anatomy and Physiology|Martin Caon|| Chapter number:17.2| Question number:64
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Medicine
C: At a distance of 5 m, the dose would be (1/5)2 = 1/25 of that at a distance of 1 m. Hence dose would be 400/25 = 16 mGy/hr. If exposed for 2½ hours, dose would be 2½ × 16 = 40 mGy
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