Which quantity is specifically used to summarize radiation burden across a population for risk assessment?

• A. Ambient dose equivalent.
• B. Deep-dose equivalent.
• C. Collective dose.
• D. Effective dose.

Answer: (C)

The idea here is to capture the total radiation impact on a whole group, not just on an individual. Collective dose does that by summing the effective doses received by every person in the exposed population, giving a single metric of population burden. It is expressed in person-sieverts and lets you compare different scenarios or protective actions on a population level, guiding risk management and resource allocation.

Ambient dose equivalent describes a field or environment at a location, useful for environmental monitoring but not for total population burden. Deep-dose equivalent targets the external dose to a single person, typically in occupational settings. Effective dose rates an individual’s risk, but the population metric comes from summing across all individuals, which is why collective dose is the appropriate choice for population risk assessment.