GEIGER COUNTER TEST-SOURCE: FOUR OUNCE FIESTAWARE ORANGE GLAZE CERAMIC 14% uranium in glaze These pieces average 25,000 CPM when measured with a standard pancake probe, such as the Ludlum 44-9 pancake probe. $12.00 plus shipping SAME LOW PRICE FOR ELEVEN YEARS; since 2013! NO price inflation, other than USPS postage costs. FIESTAWARE RED-ORANGE CERAMIC PLATE SHARDS, 4 OZ., 1936-1943 VINTAGE with 14% natural glaze FiestaWare, a top-selling brand of household ceramic plates, used natural material to color their ceramic glaze during the years from 1936-1943. These ceramics were made in USA by the Homer Laughlin Ceramics Co. of West Virginia. In 1943, the government's Manhattan Project, led by Professor Robert Oppenheimer, confiscated the company's uranium supplies because they were needed for the WWII war effort. If you have a Geiger counter, you need to have "test sources" to check and calibrate your instrument. Each clear plastic bag seen in the photos has 4 ounces of Fiestaware red- orange ceramic plate fragments. As seen in photos, I have measured the activity level of some of the larger shards. The Ludlum 2100-1 scaler- counter and 44-9 pancake probe give the most accurate readings possible: the 2100-1 scaler digitally counts every pulse; it does NOT merely do an analog estimate. The ceramic pieces give moderate average readings of approximately 25,000 cpm units. Bags of the orange ceramic are available, each for the $12.00 price plus shipping. The heavy plastic bag weights about half an ounce (14 grams). FiestaWare red plates are still made, but the natural content was removed after 1943. If you buy FiestaWare from later years, it will look like the pieces seen in the photos, but it will have no activity level at all. My fragments are guaranteed to be from the 1936-1943 era, with measurable activity. SHIPPING: This will be via ground- advantage only, and all postal regulations regarding packaging will be carefully followed. $12.00 + s/h 4 oz. net weight SHIPPING NOTES I do combined shipping, so look at my other ads, also. If you order two or more items, pay the postage as stated in the ad. Then, when the parcel is mailed, I will refund any overpayment on postage above the actual cost of postage. The parcel will be wrapped and shipped in accordance with all postal regulations. This ad is for the bags of ceramic pieces only; The Ludlum 2100-1 scaler instrument and 44-9 pancake probe are NOT INCLUDED (!) Price: $12.00 each 4 oz. bag, plus shipping HHHHHHHHHHHHHHHHHHHHHHH Stephen Buggie, Ph.D. Psychology Professor Emeritus Univ. of New Mexico, Gallup