Which statement correctly describes the units used for absorbed dose and dose equivalents, and their relation?

• A. Absorbed dose in Sieverts; dose equivalent in Grays.
• B. Absorbed dose is measured in Gray (Gy); dose equivalent and effective dose are measured in Sievert (Sv). 1 Gy × radiation weighting factor = Sv; effective dose sums organ doses using tissue weighting factors.
• C. Absorbed dose in rem; dose equivalent in sieverts; no relation.
• D. Absorbed dose in Grays; dose equivalent in Grays; multiply by exposure time.

Answer: (A)