It tells what fraction of a radioactive sample remains after a certain length of time.
It represents the time it takes for half of the material to decay to a daughter element.
it's the length of time that 50% of the mass of the isotope takes to decay to a non-hazardous state.
The rate of decay for a radioactive sample
It is 2.6 years.
One-half of the original amount. That's precisely the definition of "half-life".
I assume you mean "half life". That means, how long does it take for half of the atoms in a sample to decay.
The length of time it takes for half of a radioactive sample to decay
It is 100 years.
It depends on the radioisotope. They do not all have the same half life.
It is 11.2 years.
It is 252 days.
It is 432 years.
It is 2.6 years.
It is 15.02 hours.
It is 14.6 years.
It is 300,000 years.
It is 5.27 years.
It is 18.11 years.
It is 14.1 hours.
It is 7,380 years.