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Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 (originally called actinium K after the natural decay chain in which it appears), has a half-life of only 22 minutes.
About 2 g of calcium-48. Calcium-48 is a doubly magic nucleus with 28 neutrons; unusually neutron-rich for a light primordial nucleus. It decays via double beta decay with an extremely long half-life of about 6.4×10 19 years, though single beta decay is also theoretically possible. [22]
Nickel is one of four elements (the others are iron, cobalt, and gadolinium) [14] that are ferromagnetic at about room temperature. Alnico permanent magnets based partly on nickel are of intermediate strength between iron-based permanent magnets and rare-earth magnets. The metal is used chiefly in alloys and corrosion-resistant plating.
The amount of transuranium elements in this 500-kg batch was only 30 times higher than in a 0.4 kg rock picked up 7 days after the test. This observation demonstrated the highly nonlinear dependence of the transuranium elements yield on the amount of retrieved radioactive rock. [30]
Loss of potency requires periodic replacement of the source in radiotherapy and is one reason why cobalt machines have been largely replaced by linear accelerators in modern radiation therapy. [175] Cobalt-57 (Co-57 or 57 Co) is a cobalt radioisotope most often used in medical tests, as a radiolabel for vitamin B 12 uptake, and for the ...
The song held the number 1 position for 7 consecutive weeks, falling to number 2 on the chart dated September 27, 2003, while Dierks Bentley's "What Was I Thinkin'" overtook it at number 1. On the following chart (October 4), Bentley's song fell, allowing "It's Five O'Clock Somewhere" to return to number 1 for an eighth and final week.
ABBA Christmas — This infomercial spoof promotes a never-released album of holiday songs from "The Fleetwood Mac of cold weather" (Bowen Yang, episode host Kate McKinnon, and McKinnon's fellow SNL alums Maya Rudolph and Kristen Wiig), all set to the tunes of their well-known classics (e.g. "Gifts for Me, Gifts for You").