The employer shall define individual dose constraints relevant to foreseeable exposures for workers as:
1° Effective dose over twelve months for regular activity in controlled zones, extremity zones or radon zones referred to in Article R. 4451-23;
2° Effective dose over the duration of the intervention for work in yellow, orange or red controlled areas mentioned in article R. 4451-23 or in an operating area when industrial radiology equipment requiring a certificate of aptitude mentioned in article R. 4451-61 is used.
In order to optimise radiation protection, the dose constraints are updated periodically, as part of the risk assessment, and after each change in working methods and conditions likely to affect the health and safety of workers. The dose constraints referred to in 2° are defined before each operation.