How Much Radiation is Harmful?

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I might make a cloud chamber, which requires for a very small amount of lead 210 on a needle tip, and i have found a place to buy it. Its 0.01 microcurie, i was wondering if that's harmful to a human. And in general how much radiation can be harmful, as in what is the safe limit you should be exposed to?

Thanks
 
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Hi. I recommend you to study on International Commission on Radiological Protection and ICRP Pub.60 for the latest scientific view on this matter. Many countries regulate dose according to this report. Regards.
 

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