Picture of carbon dating
But they omit discussion of the basic flaw in the method: you cannot measure the age of a rock using radioactive dating because you were not present to measure the radioactive elements when the rock formed and you did not monitor the way those elements changed over its entire geological history.
If you check this educational page by the US Geological Society you will see that they spend all their time talking about the technicalities of radioactive decay.
How long has the competitor taken to swim the 1,500 metre race?
That is why you need at least two, sometimes three judges to measure the time of the race to the standard needed to enter the record books.
It would make no difference how accurate or high-tech the wristwatch was.
But without reliable witnesses the accuracy of the watch makes no difference.
You can only establish the time for the race if it was timed by two or more qualified eyewitnesses who observed the start, the progress and the finish.