Nuclear methods of dating
We will deal with carbon dating first and then with the other dating methods.Carbon has unique properties that are essential for life on Earth.Overall, the energy of the Earth's magnetic field has been decreasing, so more C is being produced now than in the past.This will make old things look older than they really are.It cannot be used to date volcanic rocks, for example.
The isotope concentrations can be measured very accurately, but isotope concentrations are not dates.
Also, the Genesis flood would have greatly upset the carbon balance.
The flood buried a huge amount of carbon, which became coal, oil, etc., lowering the total C ratio in plants/animals/the atmosphere before the flood had to be lower than what it is now.
This also has to be corrected for. Second, the ratio of C in the atmosphere at that time to be estimated, and so partial calibration of the “clock” is possible.
Accordingly, carbon dating carefully applied to items from historical times can be useful.
When a “date” differs from that expected, researchers readily invent excuses for rejecting the result.