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How to Calculate Half Life.
Chemistry

How to Calculate Half Life.

Rosemary Njeri

In radioactivity, half life is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.

Understanding the concept of half-life is useful for determining excretion rates as well as steady-state concentrations for any specific drug.

Formula to calculate half life.

Calculate Half Life.

In (2) is the natural logarithm of 2 which is 0.693.

λ is a positive number called the decay constant of the decaying quantity.

Example:

Calculate the half life of plutonium 239 whose decay constant is 2.88 x 10^-5 .

Calculate Half Life.

Therefore, plutonium 239 half life is 24,062.5 years.

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