Radiological Protection Ordinance
(RPO)

1 For planned ex­pos­ure situ­ations, the dose re­ceived by a per­son from a single ra­di­ation source or activ­ity shall be spe­cified (dose con­straint). This dose con­straint shall be spe­cified for each ra­di­ation source in such a way that the sum of all doses re­ceived from the vari­ous ra­di­ation sources does not ex­ceed the dose lim­it.

2 The li­cence hold­er shall spe­cify the dose con­straints for the oc­cu­pa­tion­ally ex­posed per­sons with­in the en­ter­prise.

3 The li­cens­ing au­thor­ity (Art. 11) shall de­cide wheth­er source-re­lated dose con­straints are re­quired for the pub­lic and shall spe­cify these in the li­cence. If this has not been done in the case of activ­it­ies already li­censed, the su­per­vis­ory au­thor­ity (Art. 184) may spe­cify source-re­lated dose con­straints.

4 Dose con­straints are op­tim­isa­tion in­stru­ments. When de­fin­ing dose con­straints, the cur­rent state of sci­ence and tech­no­logy must be taken in­to ac­count.

5 If a dose con­straint is ex­ceeded, meas­ures must be taken.