Which radiation measurement quantifies the risk of long-term radiation injuries, such as cancer?

Which radiation measurement quantifies the risk of long-term radiation injuries, such as cancer?

• A. Exposure
• B. Absorbed dose
• C. Effective dose
• D. Equivalent dose

Answer: (C)

Long-term radiation injuries like cancer are probabilistic effects that depend on both how much tissue is affected and how sensitive each tissue is to radiation. The best measure for representing that overall risk is the effective dose. It combines the actual energy deposited in each tissue (absorbed dose) with factors that reflect how harmful radiation is to that tissue (tissue weighting) and, for different radiation types, the differing biological impact (radiation weighting). By summing these weighted doses across all tissues, the effective dose gives a single value in sieverts that correlates with the likelihood of stochastic harm to the body. Exposure measures ionization in air and does not translate to tissue risk. Absorbed dose tells you how much energy is deposited but not how risk varies by tissue. Equivalent dose accounts for the type of radiation but still focuses on a specific tissue; effective dose extends that concept to reflect overall cancer and other long-term risks across the whole body.

Long-term radiation injuries like cancer are probabilistic effects that depend on both how much tissue is affected and how sensitive each tissue is to radiation. The best measure for representing that overall risk is the effective dose. It combines the actual energy deposited in each tissue (absorbed dose) with factors that reflect how harmful radiation is to that tissue (tissue weighting) and, for different radiation types, the differing biological impact (radiation weighting). By summing these weighted doses across all tissues, the effective dose gives a single value in sieverts that correlates with the likelihood of stochastic harm to the body.

Exposure measures ionization in air and does not translate to tissue risk. Absorbed dose tells you how much energy is deposited but not how risk varies by tissue. Equivalent dose accounts for the type of radiation but still focuses on a specific tissue; effective dose extends that concept to reflect overall cancer and other long-term risks across the whole body.