Which dose concept is used to estimate the overall health risk from exposure by summing tissue-weighted doses across the body and is measured in Sieverts?

Which dose concept is used to estimate the overall health risk from exposure by summing tissue-weighted doses across the body and is measured in Sieverts?

• A. Absorbed dose
• B. Equivalent dose
• C. Effective dose
• D. Dose-area product

Answer: (C)

Effective dose is the dose concept used to estimate overall health risk from exposure by summing tissue-weighted doses across the body. Each tissue receives an absorbed dose, which is then adjusted for the tissue’s sensitivity with a tissue weighting factor, and the contributions are added to give a single value. This total, expressed in Sieverts, reflects the probabilistic risk of stochastic effects like cancer across the whole body, not just energy deposition in one spot. This differs from absorbed dose, which is simply energy deposited per unit mass in a specific tissue and is measured in Grays and does not account for varying tissue sensitivities. It also differs from equivalent dose, which applies a radiation-type weighting factor to a single tissue, not the entire body. Dose-area product relates to the amount of energy and the area exposed in an imaging procedure, and is not a measure of whole-body risk.

Effective dose is the dose concept used to estimate overall health risk from exposure by summing tissue-weighted doses across the body. Each tissue receives an absorbed dose, which is then adjusted for the tissue’s sensitivity with a tissue weighting factor, and the contributions are added to give a single value. This total, expressed in Sieverts, reflects the probabilistic risk of stochastic effects like cancer across the whole body, not just energy deposition in one spot.

This differs from absorbed dose, which is simply energy deposited per unit mass in a specific tissue and is measured in Grays and does not account for varying tissue sensitivities. It also differs from equivalent dose, which applies a radiation-type weighting factor to a single tissue, not the entire body. Dose-area product relates to the amount of energy and the area exposed in an imaging procedure, and is not a measure of whole-body risk.