Webhalf-life of selenium-75 is 120 days and the half-lives of all other isotopes are less than eight hours. Selenium-79 decays by emitting a beta particle with a half-life of 65,000 years with no attendant gamma radiation. Selenium-79 is present in spent nuclear fuel and the wastes resulting from reprocessing this fuel. The low Selenium has seven naturally occurring isotopes. Five of these, 74 Se, 76 Se, 77 Se, 78 Se, 80 Se, are stable, with 80 Se being the most abundant (49.6% natural abundance). Also naturally occurring is the long-lived primordial radionuclide 82 Se, with a half-life of 9.2×10 19 years. [15] See more Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the See more Selenium (Greek σελήνη selene meaning "Moon") was discovered in 1817 by Jöns Jacob Berzelius and Johan Gottlieb Gahn. Both chemists … See more Native (i.e., elemental) selenium is a rare mineral, which does not usually form good crystals, but, when it does, they are steep rhombohedra or tiny acicular (hair-like) crystals. Isolation of selenium is often complicated by the presence of other compounds and … See more Physical properties Selenium forms several allotropes that interconvert with temperature changes, depending … See more Selenium compounds commonly exist in the oxidation states −2, +2, +4, and +6. Chalcogen compounds Selenium forms two oxides: selenium dioxide (SeO2) … See more Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, nickel, or lead. Electrolytic metal refining is particularly productive of selenium as a … See more Fertilizers Researchers found that application of selenium fertilizer to lettuce crops decreased the … See more
Selenium - ScienceDirect
WebGamma radiography using Selenium-75 is now generally acknowledged throughout the world to provide performance benefits relative to Iridium-192 in the working range of 5-30mm steel. Selenium-75 has a softer gamma ray spectrum than Iridium-192 and it has a significantly longer half-life. For these reasons Selenium-75 provides real performance ... WebSelenium-75 Half-Life: 120 days: Special Form Certifications: USA/0502/S-96, USA/0335/S-96. Se-75 Gamma-Ray Source Projectors. Small, light-weight Se-75 exposure devices can be used in difficult to access locations that x-ray generators cannot go due to their size, weight, and power requirements. hip2p client wifi 設定
Selenium - Element information, properties and uses
WebApr 9, 2024 · A majority of the adverse reactions center around selenium sulfide. The more common adverse effects include redness, burning, itching, stinging, scalp sores, increased oiliness, nail hyperpigmentation, and … WebSelenium Se CID 6326970 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity … WebJun 13, 2005 · A 0.6% micronized form of selenium sulfide is also safe and effective for dandruff. Mechanism of action. Topical selenium sulfide may act by an antimitotic … home remedy for foot spur