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Another error in this article is the numerous times it says "beta gamma" decay or activity. Beta decay and gamma decay are two different types of radioactive decay. They are grouped here because the radiation is more penetrating, and thus easier to detect in this context. If you want to combine you should write something like "beta and gamma activity" or "beta/gamma activity".
I would also like to add my voice to those asking for better fact checking. This article should have had at least two technical sources, and you should have shown the finished product to either one of the sources or another person with the technical background necessary to catch these errors. This article is not up to Salon's standards.