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Half-Life Worksheet Name________________ 1) Define what is meant by half life. 2) What isotope is used to date organic material? What is the half-life? 3) What isotope is used to date rocks and minerals? What is the half-life? 4) The half-life of Tc-99m used in medical imaging is 6 hours. If a patient is injected with 80mg Tc-99m, how much Tc-99m would be left in the body after 24 hours? 5) A piece of wood found in an ancient burial site contains only one fourth as much carbon-14 as a piece of wood cut from a living tree growing nearby. If the half-life for carbon-14 is 5730 years, what is the approximate age of the ancient wood? 6) The half-life of sodium-24 is 15 hours. After how many hours is the amount of sodium-24 one-sixteenth of its original amount? 7) What is the half-life of iodine-131, if, after 24 days, 0.125g remains from a 1.00g starting sample? 8) If the half-life of a radioactive material is 8 years, how many years would it take for one-half of the original amount of material to decay? 9) How does length of half-life relate to the stability of an isotope? 10) What is the symbol for half-life?