>>There's abundant scienfic evidence that increases and decreases in
>>radioactivity are not constant.
>>>>As just one example, recent measurements of
>>the changes in the strength of the Earth's magnetic field suggest that the
>>magnetic field may have been so strong just 5,000 years ago that space
>>radiation may not have even been able to enter the atmosphere.
>>> Even if so, this has nothing to do with the rate of radioactive decay
> of carbon-14 or other radioactive isotopes.
>>>>Obviously this would throw the calibration way off.
>>> No it wouldn't.
Variations in atmospheric C14 can be corrected for by reference to
The other (longer-timescale) radio-dating methods don't rely on
assumptions about the original amounts of the particular isotopes in the
atmosphere/crust/whatever, but on (experimentally verifiable)
assumptions about the elements capable of being incorporated into a
For a scientific Christian's view of radiometric dataing, see