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He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.

Further evidence comes from the complete agreement between radiometric dates and other dating methods such as counting tree rings or glacier ice core layers.The radioactive substances produced in this manner are known as radioisotopes.A nuclide is any species of atom of which each atom has an identical proton number and also an identical nucleon number.Atoms with unstable nuclei are constantly changing as a result of the imbalance of energy within the nucleus.

When the nucleus loses a neutron, it gives off energy and is said to be radioactive.When an atom varies in the number of neutrons, the variation is called an isotope. During radioactivity, the unstable isotope breaks down and changes into a different substance.A new, more stable isotope, called the decay or daughter product, takes its place.Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.