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The distinctive color of orange-red Fiestaware, which was popular in the 1930s and 1940s, is produced by uranium oxide in the glaze. For more information, see Fiestaware, and for a list of similar items, see Radioactive Consumer Products (the two websites referenced here are from Oak Ridge Associated Universities).
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Calculate Your Radiation Dose
Visit Calculate Your Radiation Dose to calculate your annual radiation dose, and see this EPA page on health effects to learn about normal doses of radiation. To find out more about natural sources of radiation, visit Sources of Radiation Natural Background Sources by the Nuclear Regulatory Commission (and don't miss the two links at the bottom). Also, food, especially the banana, is slightly radioactive, as described in this short Discover Magazine piece.