Which statement best describes effective dose?

Which statement best describes effective dose?

• A. It represents only the energy deposited in tissue.
• B. It accounts for tissue sensitivity and overall risk.
• C. It is the same as absorbed dose in tissue.
• D. It applies only to occupational exposure.

Answer: (B)

Effective dose is a risk-weighted measure that reflects not just how much energy is deposited, but how biologically significant the exposed tissues are. It does this by taking the absorbed dose in each tissue, multiplying it by a tissue weighting factor that represents radiosensitivity and contribution to overall risk, and then summing these values over all tissues. The result, expressed in sieverts, estimates the potential harm to the whole person, not just local energy deposition. This is why the statement that it accounts for tissue sensitivity and overall risk is the best description. Absorbed dose alone only measures energy per unit mass (gray) and doesn’t account for differences between tissues or whole-body risk. Effective dose is used across different exposure scenarios, not only occupational ones, to compare risks and guide protection.

Effective dose is a risk-weighted measure that reflects not just how much energy is deposited, but how biologically significant the exposed tissues are. It does this by taking the absorbed dose in each tissue, multiplying it by a tissue weighting factor that represents radiosensitivity and contribution to overall risk, and then summing these values over all tissues. The result, expressed in sieverts, estimates the potential harm to the whole person, not just local energy deposition. This is why the statement that it accounts for tissue sensitivity and overall risk is the best description. Absorbed dose alone only measures energy per unit mass (gray) and doesn’t account for differences between tissues or whole-body risk. Effective dose is used across different exposure scenarios, not only occupational ones, to compare risks and guide protection.