Quote:
Originally Posted by RandyWayne
Atomic "skid marks":
Half Lives for Radioactive Elements
Radioactive Parent
Stable Daughter
Half life
Radioactive Parent - Stable Daughter - Half life
Potassium 40 -- Argon 40 -- 1.25 billion yrs
Rubidium 87 -- Strontium 87 -- 48.8 billion yrs
Thorium 232 -- Lead 208 -- 14 billion years
Uranium 235 --- Lead 207 -- 704 million years
Uranium 238 -- Lead 206 -- 4.47 billion years
Carbon 14 -- Nitrogen 14 -- 5730 years
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And you don't have the
original values for these chemicals. You speculate and extrapolate to arrive at the original values.
We have fun with these dating schemes because it is like measuring the distance to the moon with a 12 inch ruler.
Who made the elements?
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