Is 10,000 CPM on an *item* dangerous?
Hi! I'm recently becoming more and more interested in the history of the use of radium in everyday products during the Cold War era, and I recently saw a video of a radium ore water revigator in which the creator tested the radiation using a Geiger counter. The reading was about 20,000+ CPM, and I was wondering if objects like this from the radium era are dangerous to have in your home if you are not ingesting or inhaling anything that has made direct contact with the object of course. I was under the impression that anything over 10,000 CPM is considered a health risk, but after doing a little bit of research I read that it's different if the radiation is coming from an object versus it being in the air. Can anybody expand on this claim? I'm struggling to find further information online but would like to learn more about levels of radiation on these types of items.