![]() It causes health problems, as it substitutes for calcium in bone, preventing expulsion from the body. The 1986 Chernobyl nuclear accident contaminated a vast area with 90Sr. Strontium-90 is a by-product of nuclear fission, present in nuclear fallout. In circumstances where cancer patients have widespread and painful bony metastases, the administration of 89Sr results in the delivery of beta particles directly to the area of bony problem, where calcium turnover is greatest. Strontium-89 is an artificial radioisotope used in treatment of bone cancer this application utilizes its chemical similarity to calcium, which allows it to substitute calcium in bone structures. All other strontium isotopes have half-lives shorter than 50 days, most under 100 minutes. The longest-lived of these isotopes, and the most relevantly studied, are 90Sr with a half-life of 28.9 years, 85Sr with a half-life of 64.853 days, and 89Sr ( 89Sr) with a half-life of 50.57 days. Radioactive isotopes of strontium primarily decay into the neighbouring elements yttrium ( 89Sr and heavier isotopes, via beta minus decay) and rubidium ( 85Sr, 83Sr and lighter isotopes, via positron emission or electron capture). In addition to the four stable isotopes, thirty-two unstable isotopes of strontium are known to exist, ranging from 73Sr to 108Sr. Because strontium has an electron configuration similar to that of calcium, it readily substitutes for calcium in minerals. ![]() The ratio 87Sr/ 86Sr is the parameter typically reported in geologic investigations ratios in minerals and rocks have values ranging from about 0.7 to greater than 4.0 (see rubidium–strontium dating). Thus, there are two sources of 87Sr in any material: primordial, formed during nucleosynthesis along with 84Sr, 86Sr and 88Sr and that formed by radioactive decay of 87Rb. ![]() more than three times longer than the current age of the universe). Only 87Sr is radiogenic it is produced by decay from the radioactive alkali metal 87 Rb, which has a half-life of 4.88 × 10 10 years (i.e. Its Elements -The element Ytterbium.The alkaline earth metal strontium ( 38Sr) has four stable, naturally occurring isotopes: 84Sr (0.56%), 86Sr (9.86%), 87Sr (7.0%) and 88Sr (82.58%). Jan < Thomas Jefferson National Accelerator facility – Office of Science Education. Very few uses have been found for this element.Ī Kg of ytterbium is valued at $875.00 Ytterbium has an atomic radius of 194 pm Ytterbium has a density of 6.90 grams per cubic centimeterġ7 Ytterbium Sources Los Alamos National Labs Chemistry Division. An isotope of ytterbium was used as a radiation source substitute for a portable X-ray machine where the electricity was not available. Ytterbium is used in improving the grain refinement, strength, and other mechanical properties of stainless steel. Ytterbium occurs rarely and it is recovered commercially from monazite sand (sand contains 0.03% of ytterbium). Ytterbium is named after the village of “Ytterby” near Vaxholm in Sweden. The atomic symbol for the element Ytterbium is Yb.ġ2 History Ytterbium was discovered by Jean de Marignac in Marignac believed that ytterbia was a compound of a new element. Jan <ġ1 Ytterbium The atomic number for Ytterbium is 70. Jan Los Alamos National Labs Chemistry Division. 30, 2007 < Thomas Jefferson National Accelerator Facility – Office of Science Education. Jan < Bentor, Yinon.Chemical - Strontium. ATSDR-Public Health Statement: Strontium. Strontium behaves like calcium when it is in a body.ĩ Strontium Sources Agency for Toxic Substances and Disease Registry. Food and drinking water are the largest sources of exposure to Strontium. Strontium ninety is the most hazardous of the radioactive isotopes of the chemical element strontium. Strontium compounds are used in making ceramics and glass products, pyrotechnics, paint pigments, fluorescent lights, medicines, and other products. ![]() The red flame produced by Strontium carbonate and Strontium nitrate is used in fireworks and signal flares. Magnets can be formed when Strontium is combined with Iron. This element is also used to refine the element Zinc. ![]() Coal, rocks, dust, soil, oil, surface and underground water, plants, air, and animals all contain varying amounts of Strontium.ĥ Uses Strontium is mostly used in the manufacturing of color television picture tubes. Strontium is named after the town Strontian in Scotland.Ĥ Where is it found? Strontium is found in nature in the form of minerals. It was isolated by Davey by electrolysis in 1808. Presentation on theme: "Strontium."- Presentation transcript:Ģ Strontium The atomic number for the element Strontium is 38.ģ History Strontium was discovered by Adair Crawford in 1790 as he was studying the mineral witherite (BaCO 3). ![]()
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