Which unit was once known as "Maximum Permissible Dose"?

The term "Maximum Permissible Dose" was historically used to describe established limits on exposure to ionizing radiation that were considered safe for individuals, particularly in occupational settings. The concept reflects the need to manage radiation exposure to minimize health risks, especially carcinogenic effects, due to radiation.

The "Effective Dose Equivalent" is a unit that quantifies the actual risk of biological harm from radiation exposure, taking into account both the type of radiation and the varying sensitivity of different tissues and organs. It encompasses the idea of permissible exposure by factoring in these risks and has largely replaced the older terminology of maximum permissible dose with a more precise and nuanced approach to evaluating radiation exposure risks.

By transitioning to terms like "Effective Dose Equivalent," the focus shifted toward a more comprehensive understanding of radiation safety and the integration of biological effects into the regulatory framework. This reflects ongoing advancements in radiation protection standards.