Bad Gastein ore is a rare radium ore that, like Hokutolite, contains radium-226. The reason why Bad Gastein ore and Hokutolite, which contain radium-226, are valuable and attracting attention is that radium-226 decays while emitting alpha rays, becoming radon-222. This radon-222 has a half-life of 3.8235 days, or about 91 hours, and can remain in the body for a long time after being inhaled through breathing or drinking water. We purchase from a legitimate source that mines and imports from Australia. This product is Bad Gastein ore of a size ideal for making radon water, with the surface other than the cut surface polished, making it very easy to handle.