Rubidium strontium dating equation
(Authors who do not wish to use symbols sometimes write out the element name and mass number—hydrogen-1 and uranium-235 in the examples above.)The term is used to describe particular isotopes, notably in cases where the nuclear rather than the chemical properties of an atom are to be emphasized.
U to an isotope of uranium widely used for nuclear power generation and nuclear weapons fabrication.
The last term, the so-called pairing energy, takes on any one of three values depending on whether ).
More-detailed treatments sometimes give other values for δ as well.
This correction is necessitated by the observation that the nuclear charge distribution becomes somewhat more spread out near the surface of the nucleus.Isotopes are said to be stable if, when left alone, they show no perceptible tendency to change spontaneously.Under the proper conditions, however, say in a nuclear reactor or particle accelerator or in the interior of a star, even stable isotopes may be transformed, one into another.A few years later, Soddy published a comparison of the atomic masses of the stable element lead as measured in ores rich in uranium and thorium, respectively.He expected a difference because uranium and thorium decay into different isotopes of lead.