Radioisotope Abundances

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The following table lists the known radioactive nuclides with half-lives greater than 1 million years and whether they're found in nature. Here is elegant proof that the earth is old!

Nuclide Half-Life (years) Found in Nature?
V-50 6,000,000,000,000,000 Yes
Nd-144 2,400,000,000,000,000 Yes
Hf-174 2,000,000,000,000,000 Yes
Pt-192 1,000,000,000,000,000 Yes
In-115 600,000,000,000,000 Yes
Gd-152 110,000,000,000,000 Yes
Te-123 12,000,000,000,000 Yes
Pt-190 690,000,000,000 Yes
La-138 112,000,000,000 Yes
Sm-147 106,000,000,000 Yes
Rb-87 48,800,000,000 Yes
Re-187 43,000,000,000 Yes
Lu-176 35,000,000,000 Yes
Th-232 14,000,000,000 Yes
U-238 4,470,000,000 Yes
K-40 1,250,000,000 Yes
U-235 705,000,000 Yes
Pu-244 82,000,000 Yes
80 M. Mark
Sm-146 70,000,000 No
Pb-205 30,000,000 No
U-236 23,900,000 Yes-P
I-129 17,000,000 Yes-P
Cm-247 16,000,000 No
Hf-182 9,000,000 No
Pd-107 7,000,000 No
Mn-53 3,700,000 Yes-P
Cs-135 3,000,000 No
Tc-97 2,600,000 No
Np-237 2,140,000 Yes-P
Gd-150 2,100,000 No
Be-10 1,600,000 Yes-P
Zr-93 1,500,000 No
Tc-98 1,500,000 No
Dy-154 1,000,000 No

[Nuclides currently produced by natural processes1 are tagged with a "P"]

Look again at the table above. Notice how every single nuclide with a half-life greater than 80 million years is found in nature; every single nuclide with a half-life less than 80 million years is not found in nature, unless it is currently being produced by nature. Does that tell you something?

You're looking at prime evidence in favor of an old Earth! Those radioactive nuclides with half-lives below a certain value have, in the turning of the ages, decayed away to nothing. The only survivors are those which can be created by nature.(2)

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