half-life

  1. B

    Chemistry Half Life Problem

    Francium-214 has a half-life for decay by alpha emission of 5ms. It forms an isotope with a half-life of 8.3 hours. After some time has passed, a pure sample of Francium-214 will become a pure binary ionic compound. what is the compound, and how much time will have to pass to form it? Please...
  2. S

    Meanlife for an archaeologist

    I am an archaeology graduate student trying to grasp the hard science behind radiometric (specifically radiocarbon) dating. I feel I have a general grasp of the concept of a half-life. What is confusing me is the meanlife. A quote from the paper I am reading will perhaps explain my confusion...