|
NAME
|
|
HALF-LIFE
|
|
Hydrogen-3 (tritium)
|
|
12 years
|
|
Beryllium-10
|
|
1 million 600 thousand
years
|
|
Carbon-14
|
|
5 thousand 700 years
|
|
Silicon-32
|
|
500 years
|
|
Phosphorus-32
|
|
14 days
|
|
Potassium-40
|
|
1 thousand million years
|
|
Calcium-42
|
|
14 thousand years
|
|
Iron-55
|
|
3 years
|
|
Cobalt-60
|
|
5 years
|
|
Nickel-59
|
|
75 thousand years
|
|
Nickel-63
|
|
10 years
|
|
Selenium-79
|
|
65 thousand years
|
|
Krypton-81
|
|
200 thousand years
|
|
Krypton-83
|
|
10 years
|
|
Rubidium-87
|
|
47 thousand million
years
|
|
Strontium-90
|
|
29 years
|
|
Yttrium-90
|
|
2 days
|
|
Zirconium-93
|
|
1 million 500 thousand
years
|
|
Niobium-93m
|
|
14 years
|
|
Niobium-94
|
|
20 thousand years
|
|
Molybdenum-93
|
|
3 thousand 500 years
|
|
Technetium-99
|
|
200 thousand years
|
|
Ruthenium-106
|
|
1 year
|
|
Palladium-107
|
|
6 million 500 thousand
years
|
|
Cadmium-113m
|
|
14 years
|
|
Tin-126
|
|
100 thousand years
|
|
Antimony-125
|
|
3 years
|
|
Antimony-126
|
|
12 days
|
|
Tellurium-125m
|
|
58 days
|
|
Iodine-129
|
|
15 million 700 thousand
years
|
|
Cesium-134
|
|
2 years
|
|
Cesium-135
|
|
2 million 300 thousand
years
|
|
Cesium-137
|
|
30 years
|
|
Cerium-144
|
|
3 hundred days
|
|
Promethium-147
|
|
3 years
|
|
Europium-154
|
|
9 years
|
|
Europium-155
|
|
5 years
|
|
Hafnium-182
|
|
9 million years
|
|
Tantalum-182
|
|
1 hundred days
|
|
Rhenium-187
|
|
50 thousand million
years
|
|
Lead-205
|
|
14 million 300 thousand
years
|
|
Lead-210
|
|
22 years
|
|
Bismuth-208
|
|
400 thousand years
|
|
Bismuth-210
|
|
5 days
|
|
Bismuth-210m
|
|
3 million years
|
|
Polonium-210
|
|
138 days
|
|
Radon-222
|
|
4 days
|
|
Radon-223
|
|
11 days
|
|
Radium-224
|
|
37 days
|
|
Radium-225
|
|
14 days
|
|
Radium-226
|
|
1 thousand 600 years
|
|
Radium-228
|
|
6 years
|
|
Actinium-225
|
|
10 days
|
|
Actinium-227
|
|
22 years
|
|
Thorium-227
|
|
19 days
|
|
Thorium-228
|
|
2 years
|
|
Thorium-229
|
|
7 thousand 300 years
|
|
Thorium-230
|
|
77 thousand years
|
|
Thorium-231
|
|
1 day
|
|
Thorium-232
|
|
14 thousand million
years
|
|
Thorium-234
|
|
24 days
|
|
Protactinium-231
|
|
32 thousand 800 years
|
|
Protactinium-233
|
|
27 days
|
|
Protactinium-234
|
|
27 days
|
|
Uranium-232
|
|
72 years
|
|
Uranium-233
|
|
200 thousand years
|
|
Uranium-234
|
|
200 thousand years
|
|
Uranium-235
|
|
700 million years
|
|
Uranium-236
|
|
23 million years
|
|
Uranium-238
|
|
4 thousand million years
|
|
Neptunium-237
|
|
2 million years
|
|
Plutonium-238
|
|
88 years
|
|
Plutonium-239
|
|
24 thousand 100 years
|
|
Plutonium-240
|
|
6 thousand 500 years
|
|
Plutonium-241
|
|
14 years
|
|
Plutonium-242
|
|
400 thousand years
|
|
Americium-241
|
|
400 years
|
|
Americium-242m
|
|
100 years
|
|
Curium-244
|
|
18 years
|
