**half life radioactive dating definition** - If an object contains a pound of a radioactive substance with a half-life of fifty years, at the end of that time there will be half a pound of the radioactive substance left undecayed in the object. Lesson summaryso, to sum this all up, radioactive dating is the process scientists use to conclude the ages of substances dating back several to many years ago by using the isotopes of elements and their half-lives. , as reported by science daily, radiocarbon dating was used to identify a forged painting based upon the concentrations of carbon-14 (detected on the canvas) within the atmosphere at the time that the picture was painted. For example, if one starts with 100 grams of radium 229, whose half-life is 4 minutes, then after 4 minutes only 50 grams of radium will be left in the sample, after 8 minutes 25 grams will be left, after 12 minutes 12.

### Nuclear Half Life: Intro and Explanation

**half life**is the time that it takes for one half of a ...