True or False: After 3.8 days, a radon isotope with a half-life of 3.8 days will have half its original amount left.

The statement is true. In radioactive decay, the half-life of an isotope is defined as the time it takes for half of the radioactive material to decay. Therefore, if a radon isotope has a half-life of 3.8 days, it means that after 3.8 days, precisely half of the original quantity of that isotope will remain undecayed. This principle is fundamental to understanding the decay process and is applicable to all radioactive isotopes when discussing their half-lives. The concept clearly illustrates how the remaining quantity decreases exponentially over successive half-lives, reinforcing the significance of the half-life in radon measurement and safety protocols regarding radon exposure.