Radioisotope Decay Charts

These radioisotope decay charts have been included to provide our customers with a valuable tool for their day-to-day business.

How To Use These Tables

The decrease of activity of a radioisotope with time is given by the equation:

A(t) = A(o) exp (-0.69315 t/T)

where

• A(o) is the activity at any time
• A(t) is the activity after a further time t has elapsed
• T is the half-life of the radioisotope, expressed in the same units as t.