Don't want to seem disrespectful wub but this is the same old BS you hear about K24 camera lenses and old compasses. It's not emitted radiation that's the risk but ingestion of the material. You actually have to break the things open and inhale or swallow the luminous paint to be put at risk, even then the hazards are minimal. And that information came from another aviation enthusiast who is also a expert on the subject.
As for HSE? Don't encourage me to go down that road. If we all had to live by their rules you wouldn't be allowed to wipe your own backside after going to the toilet.
