OK, I listened to this so that others don't have to (junto, good Buzzfeed impression, but please don't do it again). Allegedly (note: I haven't checked any of t

OK, I listened to this so that others don't have to (junto, good Buzzfeed impression, but please don't do it again). Allegedly (note: I haven't checked any of these figures, but I have tried to be a bit clearer about units): Typical natural background radiation: 2mSv/year. CT scan (one-off): 7mSv. Total extra radiation (over a lifetime) for people around Fukushima: 10mSv. US radiation workers' limit: 50mSv/year. Astronauts on ISS: 160mSv/year. Average smoker: 160mSv/year.