Is the half-life of Primordial Nuclide determined only by the age of the earth? Or are their other age defining considerations? The point of the question is to know that the only reason that we have a determination of the half-life of Primordial Nuclide is by its comparison solely to the lifespan of the earth, or if their is any other foundation for determining the half-life.
I want an alternate method of determining the duration half-life of a Nuclide. Specifically Primordial Nuclide. The only method that I know about right now is through visual measurement.