Austin simply assumes that the first explanation is correct and then he proceeds to use the 'presence' of 'excess argon' in his samples to question the reliability of all K-Ar dates on other rocks and minerals.
Generally, that means that 37 billion atoms in the sample are decaying and emitting a particle of nuclear radiation (such as an alpha particle) per second.
The validity of either hypothesis #2 or #3 would provide additional evidence that Austin's application of the K-Ar method is flawed and that he has failed to prove that the K-Ar method is universally invalid.
A British team reported finding markings in a layer of volcanic ash in a Mexican quarry that they interpreted as human footprints. Bennett, Silvia Gonzalez, David Huddart (2010) Techniques for verifying human footprints: reappraisal of pre-Clovis footprints in Central Mexico Quaternary Science Reviews, Volume 29, Issues 19-20, September 2010, Pages 2571-2578.
The rate of iodine-131 uptake, determined with a Geiger counter or other scanning device, indicates whether the thyroid glands are functioning properly.
Sodium chloride containing sodium-24, can be injected into the bloodstream to study blood circulation.
This makes food safer and also keeps it fresh longer.