For example, you may want to date a zircon crystal using a secondary ion microprobe (SIMS).This technique bombards the sample, slowly drawing material out and then sending it through to an ion counter.This is then transformed into isotopic ratios and then used to date the material.The machinery you use has to be tuned and calibrated to which isotopes you want to measure and needs to be set with the correct running conditions.I found several good sources, but none that seemed both complete enough to stand alone and simple enough for a What is radiometric dating?Simply stated, radiometric dating is a way of determining the age of a sample of material using the decay rates of radio-active nuclides to provide a 'clock.' It relies on three basic rules, plus a couple of critical assumptions.Radioactivity was discovered in 1896 by French physicist Henri Becquerel.By 1907 study of the decay products of uranium (lead and intermediate radioactive elements that decay to lead) demonstrated to B. Boltwood that the lead/uranium ratio in uranium minerals increased with geologic age and might provide a geological dating tool.
The probability of a parent atom decaying in a fixed period of time is always the same for all atoms of that type regardless of temperature, pressure, or chemical conditions. The time required for one-half of any original number of parent atoms to decay is the half-life, which is related to the decay constant by a simple mathematical formula.
Think of it as making a roast dinner, you're going to need to set the oven at the correct temperature and leave it for the right amount of time to achieve the best results.
So you can never have perfect running conditions and certain parameters will change over time, this is just the nature of high-tech machinery.
Its crust is continually being created, modified, and destroyed.
As a result, rocks that record its earliest history have not been found and probably no longer exist.Radiometric dating methods are the strongest direct evidence that geologists have for the age of the Earth.