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They need to be active long enough to treat the condition, but they should also have a short enough half-life so that they don’t injure healthy cells and organs.
Radioactive dating is helpful for figuring out the age of ancient things.
Have you ever wondered how it's possible to so accurately date ancient artifacts?
Geologists, paleontologists, archeologists, and anthropologists use a statistical process like radioactive isotope decay to date objects through a method called radioactive dating (also known as radiometric dating).
It takes a certain amount of time for half the atoms in a sample to decay.Scientists know the half-life of C-14 (5,730 years), so they can figure out how long ago the organism died.Carbon-14 dating can only be used to determine the age of something that was once alive.Naturally occurring radioactive isotopes have been very useful in dating (estimating age) of the geological events.Thus the technique of detecting the amount or quantity of any radio isotope in the sample of the rock, dead plants or organism in any bio residue to estimate and measure its actual or exact age is called radioactive or radio isotope dating.
The rule is that a sample is safe when its radioactivity has dropped below detection limits. So, if radioactive iodine-131 (which has a half-life of 8 days) is injected into the body to treat thyroid cancer, it’ll be “gone” in 10 half-lives, or 80 days.