This form can be used to calculate caesium-137 inventory in mBq / cm^2 or radioactivity per unit mass in mBq / g if cumulative counts, counting time (in seconds), total sample weight (in gram), detected sample weight (in gram), area of sampling tube (in cm^2), and detect efficiency are properly given. Cautions are drawn to the units being used.

counting area | counting time | area of sampling tube |

total weight | detected weight | detect efficiency |

The caesium-137 activity is:

in mBq / cm^2 or in mBq / g