Radiometric dating instruments
The claimed “fact” that decay rates have always been constant is actually an inference based on a uniformitarian assumption.It is true that radioisotope decay rates are stable today and are not largely affected by external conditions like change in temperature and pressure, but that does not mean that the rate has always been constant.
The Bible gives a much different picture and explains that relying on man’s reasoning is foolishness.
A fear of God and reverence for His Word is the beginning of wisdom.
Starting with the Bible and developing a model for dating events in earth history will lead us to the truth.
If certain things are known, it is possible to calculate the amount of time since the parent isotope began to decay.
For example, if you began with 1 gram of carbon-14, after 5,730 years you would be left with 0.50 g and only 0.25 g after 11,460 years.