Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.
The slope of the line determines the date, and the closeness of fit is a measure of the statistical reliability of the resulting date.
Technical details on how these dates are calculated are given in Radiometric dating. As with any experimental procedure in any field of science, these measurements are subject to certain "glitches" and "anomalies," as noted in the literature.
Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.
Have you every noticed the amazingly coincidental similarity between these two names - Jesus Christ and Lord Krishna - and asked yourselves, why the names of two major religious figures in two major religious are exactly the same?
Have you every looked at the evolution of religions and wondered if it's possible that Christianity is actually derived from Hinduism (partly the story of Lord Krishna)? Many leading experts believe that not only the name Jesus Christ is a derivative of Lord Krishna, but also, the religion of Christianity might be partially and fully derived from Hinduism!
In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.
These chronologies are hotly debated among Christians and secularists alike, with the consensus being increasingly challenged.
Now, this one similarity in numbers might be disregarded by Christian skeptics as a coincidence, but when we start looking deeper into different versions of Bible (yes, Bible has many versions and sometimes contradictory stories), we find that this number 12 is repeated again and again in the life of Jesus.
For example, the last time we see Joseph in any of the gospels is also when Jesus was 12 years old (this is found in the story of passover visit to the temple in Luke).
Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.
The latest high-tech equipment permits reliable results to be obtained even with microscopic samples.