Stop spreading such nonsense articles, please! Just because the immediate impact is comparatively low, that doesn't mean it's harmless.
Radiation is a carcinogen, yes. But it turns out that radiation is a really puny carcinogen. A radiation dosage which will probably kill you if delivered rapidly -- 4 Sieverts -- has only a small chance of causing cancer -- about 10% (and an even lower chance of causing lethal cancer).
This is called the "linear hypothesis" and is widely used. They use it in medicine to decide if diagnostic scans are worth the risk. The risk could actually be lower; some scientists think there's a threshold below which there's no risk. There's too much statistical uncertainty at low exposure levels to know for sure.
This is the course site, click webcast lectures on the side: http://muller.lbl.gov/teaching/physics10/pffp.html
It's easy to get cancer by smoking. It's really really hard to get cancer from radiation without giving yourself a lethal acute dose of radiation in the process.
Half of all wild boars shot in central Europe can not be sold because their radiation levels are still too high for general consumption because of Chernobyl.