https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8173998/
The core of the current system of radiological protection (SRP) consists of 3 fundamental principles: justification, optimization, and applying ionizing radiation dose limits 1 : the principle of justification specifies that any activity (or intervention) that changes the exposure scenario should be overall beneficial to individuals and/or society; the principle of optimization specifies that radiation doses should be as low as reasonably achievable, considering both economic and societal factors; the principle of dose limitation applies to planned radiation exposures (other than medical and environmental) and dictates that doses should not exceed established limits. The dose limits are linked to the linear-no-threshold (LNT) risk model for ionizing radiation harm.