Uranium ore mineral 2.49kg/5.5lb San Juan Co, Utah - Geiger counter test source

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This piece of uranium ore comes from the historically significant Mi Vida Mine in San Juan County, Utah. Charlie Steen's discovery of this incredibly rich mine in 1952 started the uranium mining boom on the Colorado plateau. This specimen weighs 2.49kg (5.49lb) . On my Geiger counter using a JAN 5979 tube (in a DT-613A probe), I measured 1,250 CPM with the beta shield closed and 4,700 CPM with the shield open on the most active surface. Sample No MV-098 Note: If you are buying more than one item from me, please request a total at checkout so I can combine the items into a single shipment and calculate the most economical shipping cost for you. This item is being sold in compliance with eBay's hazardous materials policy. It is a natural ore sample with trace amounts of radioactivity. Per the hazardous materials policy, I am required to inform you that this rock emits alpha, beta, and gamma radiation and may pose a slight health risk if improperly stored or handled. This item will be mailed in a package which conforms to the conditions and limitations specified in 49 CFR 173.426 for radioactive material, excepted package articles manufactured from natural uranium (or natural thorium), UN2909, and is within Postal Service activity limits for mailing. Packaging and shipping methods fully comply with USPS requirements, as detailed in USPS Publication 52. Information regarding radiation measurements Measurements are intended to give potential buyers a rough idea of the activity level of a given specimen. Measurements are recorded in counts per minute, which vary greatly between different tube types and probe styles. I use a large end-window tube for my measurements, which should give a reasonable idea of the response of a Geiger counter equipped with a standard external probe (this probe came from a U.S. Navy PDR-27 series counter). Pancake-style probes will read significantly higher count rates and small Geiger counters with small internal Geiger tubes will generally give significantly lower count rates. For comparison purposes, below is a table that compares the response rates of several different types of tubes against several different samples. The first number for a sample is the CPM reading with the beta (β) shield closed, which means that only gamma (γ) rays will be measured. The second number is the measurement with the beta shield open, which means that alpha (α), beta (β), and gamma (γ) are permitted to reach the tube. The highlighted row is the probe I used to obtain the CPM values in the description of this item. Tube Tube Type Background Red-OrangeFiesta Ware Lantern Mantle Thorite (2g) Pitchblende(135g) 10 μCi Cs-137(age < 0.1y) 6993 Small side window tube in CDV-700 probe (β/γ) 20 - / 2,570 170 / 1,680 740 / 6,650 8,200 / 12,300 10,000 / >30,000 JAN 5979 Large end-window tube in DT-613A probe (β/γ) 40 - / 2,800 340 / 3,700 1,070 / 8,200 23,000 / 58,900 13,300 / 148,000 JAN 5980 Small windowless metal tube in probe (γ) 2 - / - 24 / - 280 / - 3,970 / - 4,300 / - LND 712 Small end-window tube in probe (α/β/γ) 22 330 / 1,100 300 / 650 1,700 / 3,700 15,700 / 21,700 14,000 / 110,000 LND 725 Medium-size metal tube in Ludlum 44-38 probe (β/γ) 22 - / 1,600 250 / 830 700 / 4,200 15,200 / 27,000 10,000 / 100,000 LND 7311 Large pancake in Ludlum 44-9 probe (α/β/γ) 65 - / 33,000 260 / 20,000 1,400 / 28,000 28,000 / 220,000 17,000 / 320,000 LND 7317 Large pancake in Inspector USB (α/β/γ) 65 - / 35,600 - / 21,200 - / 30,500 - / 300,000 - / >360,000 SBM-19 Large metal tube (β/γ) 170 - / 36,200 520 / 24,200 1,700 / 13,000 31,000 / 69,500 21,500 / 183,000 SBM-20 Small metal tube (β/γ) 20 - / 10,700 250 / 11,000 970 / 12,100 14,000 / 62,300 10,000 / 22,000 SBT-10A Large rectangular pancake (α/β/γ) 250 7,000 / 28,800 14,300 / 18,000 14,500 / 15,000 93,000 / 131,300 31,500 / 212,000 SBT-11A Small rectangular pancake (α/β/γ) 30 - / 5,900 190 / 3,800 1,000 / 8,800 14,000 / 62,000 17,000 / 321,000 SI-29BG Small metal tube (β/γ) 12 - / 5,700 120 / 6,450 1030 / 8,600... read more

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