The alkali earth metal strontium (Sr) has four stable, naturally occurring isotopes:84Sr (0.56%), 86Sr (9.86%), 87Sr (7.0%) and 88Sr (82.58%). It's a standard atomic mass of 87.62(1) u. Only 87Sr's radiogenic; it's produced by decay from the radioactive alkali metal 87Rb, which has a half-life of 4.88 × 1010 years. Thus, there're two sources of 87Sr in any material: that formed during primordial nucleo-synthesis along with 84Sr, 86Sr and 88Sr, as well as that formed by radioactive decay of… (More on Strontium-89)