# Radioactive Effective Half Life Time Calculator

Radioactive effective half life time is defined as the time interval required for the radioactivity of a certain amount of radioactive substance distributed in tissues and organs. It decreases to half its original value due to radioactive decay and biological elimination. Given here is an online radioactive effective half life time calculator to estimate the result for the given required input values.

### Example:

The physical half life time is longer than the biological half life time which is longer than the effective half life time. Enter the physical and biological half life time in this radioactive effective half life time calculator to find the resultant value.

Calculate radioactive effective half life time for physical half life time as 8 and biological half life time as 5?

#### Solution:

= (8 x 5) / (8 + 5)

= 3.07