I saw one of these at the De Havilland Aircraft Museum, such a neat piece of kit.<br>Their one is in working order too :D,(reply>), @Tea And Medals a radium dial held directly against the body (e.g. a pocket watch) gives a dose of around 10 µSv / hour. That means in 20 minutes you get the equivalent of a single day's exposure to background radiation. Exposure drops off exponentially as you get farther from the source. <br><br>Radium dials do generate a decent bit of radon which may be their concern with putting someone in there and closing the top, but it would probably take hours for it to build up to the maximum permissible limit.<br><br>The biggest concern with old radium dials is the decay of the paint resulting in radioactive dust. Inhaling any of that dust is a serious, serious problem. As long as it's sealed inside the instruments, I don't see that as being a problem in this case.,(reply>), @ParadigmUnkn0wnYep, you're spot on all points. It's a shame to see it just sitting there not doing anything due to excessive rules. Hopefully one day the Aviation Society will be able to get some alternative instruments installed and restore it.,(reply>), @Tea And Medals it's sad that they make such an issue of the radium dials. It resulted in the one in this video ending up with stickers instead of gauges, and apparently the one you mention is intact but not allowed to be used. The real issue with radium was the effects it had on the poor gals that had to paint the dials and often even licked the brushes to orient the fibers. For someone to spend a few minutes around the sealed, already painted dials, the exposure is negligible.,(reply>), Hi Iron!,(reply>), @Jan Chellini yes