What is the term used for the amount of radiation received that does not significantly change life span?

The correct term for the amount of radiation received that does not significantly change life span is indeed described by the phrase "Dose Equivalent Limit." This term refers to the established upper boundary of radiation exposure that is considered safe for individuals, designed to protect them from the harmful effects of radiation. It is a regulatory measure that balances the risks associated with radiation exposure against the potential benefits of procedures that may involve such exposure, ensuring that while individuals may receive ionizing radiation, it does not reach levels deemed harmful enough to significantly alter life expectancy.

In contexts such as occupational safety and radiological protection, the Dose Equivalent Limit helps guide the maximum allowable radiation doses in various situations, acknowledging that there may be minimal risks associated with lower levels of exposure. By adhering to these limits, safety practices aim to ensure that individuals can work in or be around environments where radiation is present without facing substantial risks to their health or longevity.

The other terms provided do not specifically refer to this concept. RBE (Relative Biological Effectiveness) relates to the biological impact of different types of radiation rather than a limit on exposure. Mid Life Dose does not appear to be a standard term within radiation safety contexts. Ion Pair refers to the pairs of charged particles that result from ionizing radiation interacting with matter