not sure you're asking exactly but I think the answer your looking for is radioactive half-life
The length of time required for half of a sample of radioactive material to decay
This time is known as the half-life.
It's period of half of decay.
halflife
Chawad says... They are directly proportional
the half-life
The time it takes for half the atoms in a sample of a radioactive element to decay is called the half life.
The length of time required for half of a sample of radioactive material to decay
its called Half-Time...
It's called the half-life.
It disintegrates into its daughter nuclei that are much more stabler than the radioactive nuclei. If a sample of radioacictive material is left it will decay into another element over a period of time. Note that complete decay is not possible. A fraction of the original radioactive material will always remain in the sample.
This time is called "half life" and is specific for each isotope.
This is its half-life.
The half-life.
The length of time required for half of a sample of radioactive material to decay
The time it takes for half the sample to decay is called the half-life.The time it takes for half the sample to decay is called the half-life.The time it takes for half the sample to decay is called the half-life.The time it takes for half the sample to decay is called the half-life.
This time is known as the half-life.