I'm no radiation expert, but I have referred to https://xkcd.com/radiation/ https://xkcd.com/radiation/ a few times. The symptoms they describe of a solar flar

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