Overview
The two naturally occurring radioactive ores are Uranium ore and Thorium ore. Other radioactive elements (for example Radium) are found as small impurities in Uranium and Thorium ores. Generally speaking, Uranium ores are more radioactive than Thorium ores. An interesting fact is that 98% of the radiation emitted from Uranium ore is actually coming from the tiny (<0.01%) Radium impurity in the ore - which is why Uranium ore is more radioactive than Uranium metal. Ore availability varies throughout the year.
How Ore is Measured
The radiation measurements stated on all of our radioactive items is guaranteed to be accurate. All samples are measured with a modern, calibrated Geiger Counter as well as a calibrated Stabilized Assay Meter. We measure the total Beta and Gamma radiation emissions from each sample in CPM (Counts Per Minute) using a standard 'Hot Dog' probe (such as a Ludlum 44-6). Geiger Counter measurements taken with Pancake, End Window or Scintillator probes will produce highly exaggerated readings which are deceptive to the customer. The radiation level stated is the combined Beta and Gamma emission.
Radioactive Ore 
