Wiens has a Ph D in Physics, with a minor in Geology.
These are released as radioactive particles (there are many types).
With dice at the ready, students can roll their way to better understanding of how an isotope decays.
When it comes to talking about time and age on a geologic scale, our everyday watches, clocks, and units of measurement fall short. We can count seconds and even measure smaller units that help us evaluate the outcome of a race.
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.
There are over forty such techniques, each using a different radioactive element or a different way of measuring them.