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I'm no radiation expert, but I have referred to https://xkcd.com/radiation/ a few times.

The symptoms they describe of a solar flare would, according to the chart, put it at around 400 - 4000 mSv.

I'm not sure it's correct to say that cosmic rays are 20x worse than solar flares since they're over a much longer period of time and the effects of radiation are related to both the intensity and duration of exposure.



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