87Rb87Sr
The isobar pair 87Rb87Sr refers to the atomic nuclei with mass number 87, where one is the element Rubidium (Rb) with 37 protons and the other is Strontium (Sr) with 38 protons. Specifically, 87Rb is a radioactive isotope of Rubidium, and 87Sr is a stable isotope of Strontium.
The significance of this isobar pair lies in the radioactive decay of 87Rb. Rubidium-87 (87Rb) undergoes beta
In geological applications, the ratio of 87Sr to 86Sr (a stable, non-radiogenic isotope of Strontium) in a