Nattemby,
EU-OPS is a start, check out OPS 1.390 and OPS 1.680, the latter only applies to very high flying aircraft (usually business jets) that fly above FL490.
However i have to check where the yearly (20ms) and lifetime (400ms) limits are mentioned, those might be based on a pretty old EC Directive and are transcribed into national law by every EU nation which would make it difficult to search.
As flightcrew i have to do a radiation exposure training once a year (CBT) and get notified once a year by my companies radiation safety officer of my personal exposure, which is also put into the national database for workers with radiation exposure. If any flight crew becomes aware of being pregnant they have to notify the company and will get taken off flight duty at once to limit radiation exposure (they are free to fly for leisure using company provided discounted tickets though). I believe my company uses EPCARD to calculate radiation exposure, but there are other products available for that.