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Potassium—argon and argon—argon dating This is the most widely used system for radiometric dating of sedimentary strata, because it can be used to date the potassium-rich authigenic mineral glauconite and volcanic rocks lavas and tuffs that contain potassium in minerals such as some feldspars and micas.
Such a relationship results in an exponential decrease in the number of parent atoms remaining as a function of time, if "time" is expressed as the half life (the length of time required for 50% of an initial quantity of radioactive atoms to break down) .
This concept is illustrated in the diagram to the left.
In other words, radioactive decay is a Constant Rate Process.
The number of parent atoms that decay in a fixed period of time, or conversely the number of daughter atoms produced, depends on the number of parent atoms present at any point in time.