The half-life.
if all the daughters have the same parents the logical answer is 2 parents making it appproximately 11.765% Or if the parents were not present in the sample O%
its called the half-life and it is different for each nuclide.
The length of time required for half of a sample of radioactive material to decay
This is its half-life.
It is through radioactive decay that a quantity of an unstable element will decay over time. A material that is unstable will undergo this process, and the sample is said to be radioactive.
its called Half-Time...
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
It's called the half-life.
The nuclide half-life tells you what the nuclide is, and if the the decay rate is inconsistet, it can help tell what mix of nulides are presetn in the sample
It's period of half of decay.
After two half life it must be 1200 x 1/2 x 1/2 = 300 atoms.