For safety measures, what is the recommended cumulative exposure limit formula?

The recommended cumulative exposure limit formula is based on the principle of allowing a maximum exposure of 1 rem for each year of a person's age. This formula is rooted in the philosophy of radiation protection, which seeks to limit the dose received by individuals over their lifetime to reduce the potential risk of stochastic effects, such as cancer, from ionizing radiation.

The cumulative exposure limit of 1 rem per year of age means that as a person ages, their allowable radiation dose accumulates correspondingly. For example, a 30-year-old individual would have a recommended cumulative limit of 30 rem, acknowledging both the duration of their life and the multiplicative health risks associated with higher exposure levels.

This limits exposure in a way that is practical and protective for workers and the public, following guidelines provided by regulatory bodies such as the National Council on Radiation Protection and Measurements (NCRP) and the International Commission on Radiological Protection (ICRP).

Other options provided do not reflect the same principle of lifetime cumulative limits based on age or resonate with established safety protocols.