Uh, yeah, sure. C-14 is used for dating organic objects in the ranges of thousands of years ago. Try tacking K-Ar dating and get back to me. As well as the rate of decay of U-238.
You distort the science, yet say the old-Earth folks are the ones who aren't serious about addressing such?
Radioisotopes and the Age of the Earth, volume 1.
Online for free, after I paid $60 for it...
The second RATE book with the results is also online, at least all the chapters are, here: RATE Papers. Another $60 books I paid for...