one therapy contains 50x more dose than presence at fukushima per hour http://cache.gawkerassets.com/assets/images/4/2011/03/radiation_chart_01.png http://www.naturalnews.com/032136_radiation_exposure_chart.html Just to double check my facts here, I went looking for more information on the actual radiation doses used in cancer treatments. It turns out that 20,000 mSv (roughly 20 Gy) is on the low end. Epithelial tumors, for example are routinely treated with 60 to 80 Gy! Source: Wikipedia (http://en.wikipedia.org/wiki/Radiat...) Even more interestingly, doses of 45 - 60 Gy (roughly 45,000 - 60,000 mSv, see notes below) are used as a cancer prevention dose in breast cancer and cancers of the head and neck. Doctors say: its good for you. its for your health!