Answer
68.38% of his total exposure is due to Radon.
Work Step by Step
Total exposure = 0.585 rem
radiation from Radon per year = 0.400 rem
Hence, percentage exposure due to Radon = $\frac{0.400}{0.585}$$\times$100% = 68.376 $\approx$ 68.38%
Introductory Chemistry (5th Edition)
by Tro, Nivaldo J.
Published by
Pearson
ISBN 10:
032191029X
ISBN 13:
978-0-32191-029-5
Chapter 17 - Radioactivity and Nuclear Chemistry - Exercises - Cumulative Problems - Page 640: 95
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