By comparison the behavior of the genera of trees used in dendrochronology is more reliable and consistent. This is based on the beta decay of rubidium to strontiumwith a half-life of 50 billion years. Cambridge University Press, Carbon dating only works for objects that are younger than about 50, years, and most rocks of interest are older than that. Most of the handful of appropriate decay schemes are listed. Over time, ionizing radiation is absorbed by mineral grains in sediments and archaeological materials such as quartz and potassium feldspar. Generally a shorter half-life leads to a higher time resolution at the expense of timescale.
The iodine-xenon chronometer  is an isochron technique.
How Does Carbon Dating Work
Radiometric dating Conservation and restoration. This causes induced fission of U, as opposed to the spontaneous fission of U. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. If we measure the amount of 12 C and the amount of 14 C in an organic sample, then since we know the atmospheric ratio and the amount of 12 C present, we can deduce how much 14 C was present originally. You might mention how this is becoming more difficult as atmospheric CO2 is changing with increased old carbon from fossil fuels which both requires an adjusting factor and decreases the accuracy of more recent measurements.