Isotope60 — Radioactive Isotopes Reference
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Half-life = time required for half of a radioactive substance to decay.

Units
-----
h  hours
d  days
y  years
ky thousand years
My million years
Gy billion years


Isotopes (Alphabetical)
-----------------------

Am-241   Americium-241        432.2 y
C-14     Carbon-14            5,730 y
Cm-244   Curium-244           18.1 y
Co-60    Cobalt-60            5.27 y (This is us!)
Cs-137   Cesium-137           30.17 y
H-3      Tritium              12.32 y
I-129    Iodine-129           15.7 My
I-131    Iodine-131           8.02 d
Ni-63    Nickel-63            100 y
Np-237   Neptunium-237        2.14 My
P-32     Phosphorus-32        14.3 d
Po-210   Polonium-210         138 d
Pu-238   Plutonium-238        87.7 y
Pu-239   Plutonium-239        24,100 y
Pu-240   Plutonium-240        6,561 y
Ra-226   Radium-226           1,600 y
Sr-90    Strontium-90         28.8 y
Tc-99    Technetium-99        211,000 y
Th-230   Thorium-230          75,380 y
Th-232   Thorium-232          14.0 Gy
U-234    Uranium-234          245,500 y
U-235    Uranium-235          703.8 My
U-238    Uranium-238          4.47 Gy


Notes
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Half-life values are approximate.
Many isotopes decay into radioactive daughter products.

Sources
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IAEA Nuclear Data Services
National Nuclear Data Center