LIFE SCIENCE

Detailed explanation-1: -Depending on the radionuclide, this process could be fast or take a very long time – radioactive half-lives can range from milliseconds to hours, days, sometimes millions of years.

Detailed explanation-2: -Bismuth-209 (209Bi) is the isotope of bismuth with the longest known half-life of any radioisotope that undergoes -decay (alpha decay). It has 83 protons and a magic number of 126 neutrons, and an atomic mass of 208.9803987 amu (atomic mass units). Primordial bismuth consists entirely of this isotope.

Detailed explanation-3: -The radioisotopes used for imaging and treatment in medical sciences are usually synthesized and have a short half-life so that they may not persist in the body for an unnecessarily long time.

Detailed explanation-4: -Associated Hazards Half-life is crucial when determining the danger of an isotope. If a radioactive substance has a very long half-life, we know that it will remain radioactive for a very long time. The longer a substance remains radioactive, the more dangerous it is.