Its principal decay products are thorium-227 (18.5-day half-life), radium-223 (11.4-day half-life), and a number of short-lived products including radon, bismuth, polonium, and lead isotopes. 227 Ac is uiterst radioactief. Phone: +971 4 429 5853 e-mail: info@lenntech.com, Copyright © 1998-2020 Lenntech B.V. All rights reserved, Plant Inspection & Process Optimalisation, Separation and Concentration Purification Request. The greatest threat of radioactivity to life as we know it is damage to the gene pool, the genetic make-up of all living species. actinium: translation /ak tin"ee euhm/ , n. Chem. The two naturally occurring isotopes are actinium-227 and actinium-228. It is about 150 times as radioactive as radium, making it valuable as a neutron source. Learn More. Actinium-227, a decay product of uranium-235, is a beta emitter with a 21.6-year half-life. Friedrich Otto Giesel independently discovered actinium in 1902. Only epidemiological evidence is scientifically acceptable to impute cause. Naturally occurring actinium is composed of two radioactive isotopes; 227 Ac (from the radioactive family of 235 U) and 228 Ac (a granddaughter of 232 Th). Its element symbol is Ac. The Science Behind Antibody Radiation Conjugates. Applications It is about 150 times as radioa… Isotopes. Actinium: Symbol: Ac: Atomic Number: 89: Atomic Mass: 227.0 atomic mass units Number of Protons: 89: Number of Neutrons: 138: Number of Electrons: 89: Melting Point: 1050.0° C: Boiling Point: 3200.0° C: Density: 10.07 grams per cubic centimeter: Normal Phase: Solid: Family: Rare Earth Metals: Period: 7: Cost: Unavailable Friedrich Oskar Giesel later independently isolated it in 1902 and, unaware that it was already known, gave it the name emanium. Thirty-six radioisotopes have been identified, the most stable being 227 Ac with a half-life of 21.772 years, 225 Ac with a half-life of 10.0 days and 226 Ac with a half-life of 29.37 hours. It is also sometimes considered the first of the 7th-period transition metals, although lawrencium is less commo… a radioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Actinium has atomic number 89, meaning each atom of the element has 89 protons. Actinium atoms have 89 electrons and the shell structure is 2.8.18.32.18.9.2. Actinium-225 is used in medicine to produce Bi-213 in a reusable generator or can be used alone as an agent for radio-immunotherapy. Isotopes of Actinium. The most stable isotope, Ac 227, has a half life of 217 years. Even low-dose exposures are carcinogenic after extended exposure. Actinium metal has been prepared by the reduction of actinium fluoride with lithium vapor at about 1100 to 1300-degrees C. Naturally occurring actinium is composed of 1 radioactive isotope; with 227-Ac being the most abundant (100% natural abundance). ; Actinium was discovered in 1899 by French chemist Andre Debierne, who suggested the name for the element. The chemical behavior of actinium is similar to that of the rare earth lanthanum. Stock analysis for Actinium Pharmaceuticals Inc (ATNM:NYSEAmerican) including stock price, stock chart, company news, key statistics, fundamentals and company profile. This whole disintegration chain with its branches is called the actinium series. Radiation is a known cause of sterility. While many of these health problems are on the rise, individuals cannot prove either increase in "background" radiation or specific exposure as the cause. Is cumulative over lifetimes and generations pagina is voor het laatst bewerkt op 1 mrt 2020 om 19:54 pagina... 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