![]() 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. Periodic Table of Elements - Strontium - Sr. If you need to cite this page, you can copy this text: This database focuses on the most common chemical compounds used in the home and industry. Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
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