Strontium is a chemical element that belongs to group two of the periodic table. Therefore, strontium falls under alkaline earth metals. It is located just below calcium and its chemical symbol is written as Sr. The element was discovered in the year 1790 by an English scientist named Adair Crawford. Strontium has 26 isotopes, which are atoms of the same element that differ in their mass numbers. Four out of the 26 isotopes (84Sr,Â 86Sr,Â 87Sr, andÂ 88Sr) are stable while the rest are unstable. The most notable isotope of strontium is strontium-90 (90Sr), which is produced as an outcome of the nuclear fission of uranium (235U orÂ 238U) or plutonium (239U). The isotopes of strontium differ from the natural form of strontium in radiological properties. This paper looks at the physical, chemical and radiological properties of strontium-90.
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