All European operators are required to monitor the likely dose, usually done with a predictor programme. There are several available online (NASA do one), or larger companies have it integrated into their flight time records system.
Any (EASA) commercial aircraft going over 49,000ft is required to have monitoring equipment fitted, but in practice we just limit the Globals and Gulfstreams to 49k in the Ops Manual, since that's a lot cheaper!
