Known half-lives of radioactive isotopes are ‘known.’ Atomic fission and atomic fusion are reality, and knowing the half-lives of the radioactive isotopes involved helped make these discoveries and technologies possible. Medical linear accelerators and nuclear medicine are reality, and knowing the half-lives of the radioactive isotopes involved helped make these discoveries and technologies possible.
Carbon-14, potassium-argon, and uranium-lead are all accurate methods of dating objects specific to their particular time frames.
Some folks’ grasp on their religious beliefs is so tenuous and so shaky that they’re afraid the least little puff of knowledge will blow it away. If your belief in God depends upon the universe not being billions of years old, then you’re in deeper trouble than you can imagine, oh Ye of little faith.
Carbon-14 can date things because we can generally know the beginning count. The others are totally guessing. Otherwise the four rocks would give the same approximate date; which they don't. Also, if they were accurate they would be like TRH tries to say. The products are too young to date, instead of dating rocks of tens or hundreds of years as hundreds of thousands or millions of years old. Too many blind assumptions.
For medical use the beginning quantities are irrelevant.
