Which statements correctly define entrance skin dose (ESD) and dose-area product (DAP) and describe their role in dose management?

• A. ESD is the dose at the skin entrance; DAP is the product of air kerma and irradiated area. Both help assess and optimize protocols.
• B. ESD is total body dose; DAP is dose per area; both used for regulatory limits.
• C. ESD is effective dose; DAP is absorbed dose; both used for patient billing.
• D. ESD is exit skin dose; DAP is product of kerma and distance; both used to compute shielding.

Answer: (A)