I have done a lot of work on this issue before. I attach two previous posts on the subject.....
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On the 6610 Explorer 1, the radiation reading was 170 microsieverts per hour. That is materially above any level that could be considered safe. I took a decision to sell all of my radium watches as I considered them to be unsafe. To be honest, any radiation above a certain level is unsafe....the question is what is a reasonable level?
As a guideline, I would consider under 3 microsievert per hour as acceptable....but I still chose to sell all my radium watches....even ones that were recording 1-2 uSv per hour.
A level of 5 per hour would be too high for me and at 10, very unacceptable. I have seen some Rolex and Omega (1950s stuff) recording readings of 300-400 microsievert per hour. I asked a university lecturer who specialised in physics how he would rate such a risk. His response was that it was materially dangerous to be close to such a radiation emission for any period of time.
Hope that helps.
Best
Joe
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