Enter the half-life and the molar mass of a radionuclide into the calculator to determine the specific activity.

## Specific Activity Formula

The following formula is used to calculate a specific activity.

a = 1.32X10^16 / (T1/2 * M)

- Where a is the specific activity (Bq/g)
- T1/2 is the half-life (years)
- M is the molar mass (g/mol)

## Specific Activity Definition

Specific activity is a measure of activity per quantity of a radionuclide. Activity is a measure of the number of radioactive transformations per second that occur.

## Specific Activity Example

How to calculate specific activity?

**First, determine the half life.**Calculate the half-life of the nuclide. You can use the calculator linked above for more help on thin.

**Next, determine the molar mass.**Calculate or measure the molar mass in grams per mole.

**Finally, calculate the specific activity.**Calculate the specific activity using the formula above.

## FAQ

**What is a radionuclide?**

A radionuclide is the nucleus of a radioactive material.