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Mandatory Link to the Radiation Dose Chart from XKCD: https://xkcd.com/radiation/

If your basing radiation safety procedures on an internet png and things go wrong, you have no one to blame but yourself.

https://xkcd.com/radiation/sources.html you're free to read the sources yourself

For people down-voting this comment, note that it is a direct quote from the xkcd chart itself

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