Half-Life Lab
Interactive radioactive decay calculator - explore how isotopes decay over time and compare half-lives from milliseconds to billions of years.
๐ฌ Quick Isotope Reference
H-3
Tritium
Tยฝ = 12.3 years
Nuclear weapons, luminescent paint
โ Low
C-14
Carbon-14
Tยฝ = 5,730 years
Archaeological dating
โ Low
Co-60
Cobalt-60
Tยฝ = 5.27 years
Medical radiotherapy, sterilisation
โ High
Kr-85
Krypton-85
Tยฝ = 10.8 years
Nuclear reprocessing tracer
โ Low
Sr-90
Strontium-90
Tยฝ = 28.8 years
RTGs, bone cancer risk
โ High
I-131
Iodine-131
Tยฝ = 8.02 days
Thyroid therapy, Chernobyl hazard
โ High
Cs-137
Caesium-137
Tยฝ = 30.2 years
Medical, industrial gauges
โ High
Po-210
Polonium-210
Tยฝ = 138.4 days
Anti-static brushes; assassination
โ Extreme
Ra-226
Radium-226
Tยฝ = 1,600 years
Historical luminescent paint
โ High
U-235
Uranium-235
Tยฝ = 703 million yrs
Reactor fuel, weapons
โ Medium
U-238
Uranium-238
Tยฝ = 4.47 billion yrs
DU ammunition, fuel breeding
โ Low
Pu-239
Plutonium-239
Tยฝ = 24,100 years
Reactor fuel, nuclear weapons
โ Extreme
Am-241
Americium-241
Tยฝ = 432 years
Smoke detectors
โ Medium
Tc-99m
Technetium-99m
Tยฝ = 6.01 hours
Medical imaging - most used isotope
โ Low
โ๏ธ Decay Calculator
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