Radiation exposure: a quick guide to what each level means | World news | theguardian.com
Your Safety First | FAQs for all Rules, Regulations and Radiation
Orders of magnitude (radiation) - Wikipedia
A radiation monitor indicates 0.82 microsieverts per hour at a checkpoint to the restricted zone of a 20km radius around the crippled Fukushima Daiichi Nuclear Power Plant, in Kawauchi village, about 20
Radiation doses - Canadian Nuclear Safety Commission
This chart puts the radiation from air travel in perspective. (Spoiler: It's minuscule.) - Vox
NEA | Health Effects of Ionising Radiation on People
Understanding Japan's nuclear crisis: the basics of radiation and health
Your Safety First | FAQs for all Rules, Regulations and Radiation