But that's not really how it is when scientists are working in their labs.
To understand how the C-14 clock works and what processes are involved, let us consider the egg-timer.
Anything further back and the dates are as much as 800 years off.So scientists made calibration charts to make up for the variation.Because it decays so fast carbon-10 is not found in nature, although it can be observed as the product of some nuclear reactions.The half-lives of the five unstable isotopes of carbon differ greatly.One also assumes that all the sand is in the bottom of the glass when one turns it over. He must look for something in the bone which disappears over time, as the sand disappeared from the top chamber of the egg timer.
The disappearance must take place at a known and measurable rate.In truth, however, the amount of carbon-14 in the atmosphere varies with fluctuations in solar activity and Earth’s magnetic field, changes in atmospheric conditions and even the exploding of atomic bombs!As a result, radiocarbon dating isn’t so accurate: “Provided they are adjusted, radiocarbon dates are now considered reliable as far back as 5000 640, and only generally well back to the time of Christ.This statement is possibly surprising in view of the fact that almost any modern writer can produce a geologic timetable [based on evolutionary theory applied to "index fossils") that gives precise datings and lengths of the eras and systems and even of some of the smaller subdivisions . These figures have been obtained in various remarkable ways. ]"Ultimately, however, they are tied to three [radioactive] dates based on atomic disintegration: (1) 60 million years, the age of the pitchblende at Central City, Colorado; (2) 220 million years, the age of the pitchblende at St.Joachimstal, Bohemia; and (3) 440 million years, the age of the uranium-bearing shale at Gullhogen, Sweden.By tipping the glass when the egg starts cooking, one learns when three minutes are up and the boiling should be stopped.