Which term is used to indicate exposure of large populations to low levels of radiation?

The term that indicates exposure of large populations to low levels of radiation is "person-rem." This unit quantifies radiation exposure by combining the amount of radiation absorbed (measured in rem) with the number of individuals exposed. Essentially, it reflects the collective dose of radiation received by a population, which is critically important in assessing public health risks and making regulatory decisions regarding radiation safety.

Using the person-rem metric allows environmental health specialists and regulators to evaluate the potential impact of radiation exposure on large groups of people rather than just on individuals. This is particularly relevant in scenarios involving environmental contamination, nuclear industry practices, or emergency response situations.

Other terms like gamma-rem, radiation-rem, and quantum-rem do not specifically define the collective exposure to radiation among populations. They may reference different aspects of radiation measurement, but they lack the specific context that person-rem provides for evaluating public health safety in relation to low-level radiation exposure over time.