Originally posted by Blood Trail
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google search "radiometric dating", and you can see how it works. There are numerous radioactive isotopes that decay into a stable daughter isotopes over known and calculated periods of time. The entire premise of radiometric dating is supported by several isotopes... kind of like a checks and balances. So as far as there being a standard to compare to.. the standard is using multiple isotopes taht have different decay rates to verify each other. Some common methods used are U238 >PB206 and K40 >AR40 (potassium - Argon).
Carbon dating is only good for dead things that are younger than 50,000 years. After that, there isn't enough of the parent isotope left to be accurate. There's a slew of info out there, and most of it that is online is fairly accurate.
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