Direct dating of gold by radiogenic helium
For the zircon size we are considering, many of the fast-moving alpha particles slow to a stop within the zircon.
Red sand falling through the neck changes color to green, representing the nuclear transformation of uranium to lead. If the neck has never changed size, then the rate at which sand presently falls, combined with the amounts in the top and the bottom, would tell us how long the process has been going on.Not being a creationist, he was not familiar with our prediction.Not being in touch with the experiment, we had no control over its outcome. When we plotted the results, they fell right on the 6000 year prediction!The statistical error bars of both data and prediction meshed neatly, with the central points of each almost overlapping each other.
This remarkable line-up of experiment and theory would be unlikely to occur by chance. My chapter of the RATE "results" book shows it is very unlikely. Such low temperatures would be impossible at the depth from which our zircons came.
The zircons in the report, plus more of the same size that we obtained from the same site, had retained significant fractions (different at each different temperature at the site) of the original helium deposited.