Half-Life.

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Presentation transcript:

Half-Life

Half – Life The time it takes for half of a sample of atoms to decay is the half-life of that isotope Range: 1.5x10-4 seconds for Po-214 4.5 billion years for U – 238

Symbol Element Radiation Half-Life Decay Product U-238 Uranium-238 alpha 4,460,000,000y Th-234 Th-234 Thorium-234 beta 24.1 days Pa-234 Pa-234 Protactinium-234 beta 1.17 minutes U-234 U-234 Uranium-234 alpha 247,000 years Th-230 Th-230 Thorium-230 alpha 80,000 years Ra-226 Ra-226 Radium-226 alpha 1,602 years Rn-222 Rn-222 Radon-222 alpha 3.82 days Po-218 Po-218 Polonium-218 alpha 3.05 minutes Pb-214 Pb-214 Lead-214 beta 27 minutes Bi-214 Bi-214 Bismuth-214 beta 19.7 minutes Po-214 Po-214 Polonium-214 alpha 1 microsecond Pb-210 Pb-210 Lead-210 beta 22.3 years Bi-210 Bi-210 Bismuth-210 beta 5.01 days Po-210 Po-210 Polonium-210 alpha 138.4 days Pb-206 Pb-206 Lead-206 none stable (none)

Example C-14 1/2 life = 5700 years 1000 gram sample of C-14 would contain only 500 grams of C-14 after 1 half-life (5700 years) If a 16 grams sample of radioactive isotope decays to 1 gram after 40 days, what is the half-life?