GCSE Physics

Half Lives

The half life for some radioactive sources is very large indeed. It all depends on the type of element. For example:

ElementHalf Life
Uranium-2384,468,000,000 years
Carbon-145,730 years
Americium-241432 years
Hydrogen-34,500 days
Sodium-2415 hours

As you can see, they vary considerably! How long the half life is becomes important when putting radioactivity to good uses.

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