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Radioactive decay is a random process. Each nucleus in a sample of an isotope decays at

It happens regardless of:
- outside conditions such as temperature and pressure
- the chemical state of the isotope
- whether the radioactive substance is a solid, liquid, gas or solution.


Page 2

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Calculating and Using Half-life
If you know the half-life of a radioactive isotope, you can use it to calculate:

- The time needed for the activity, or the mass of the isotope, to fall to a certain value
- The mass of the isotope, or its activity, after it has…


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