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Lecture 32

ANTH 1210 Lecture 32: Lecture 32
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Department
Anthropology
Course
ANTH 1210
Professor
Haskel J.Greenfield
Semester
Fall

Description
Oc78 Assumes change in form or style over time Things that go in and out of fashion Absolute Dating: Historical dating: Date written on it Ex: coins, foundation deposits, corner stones on buildings, monumental inscriptions, time capsules, etc Dates place through texts (ex: Troy and the Iliad) Radiocarbon dating Willard Libby Invented 1949 First dates published 1950 Measures amount of carbon isotope in the atmosphere (C14) Radioactive isotope: unstable element, decay at a constant rate and change in form over time As they are changing they are giving off radiation Calculate amount of time since decay began (by the amount of radiation being given off) Process of C14: Nitrogen atoms in upper atmosphere, cosmic rays hit them, causes them to release a proton, become carbon 14 All living things radioactive through oxidation, C14 atoms bond with two oxygen atoms forming carbon dioxide Radioactive carbon dioxide is absorbed into plants and consumed by animals Decay rate: Halflife: the time that half of the radioactive material will decay (change) into a nonradioactive form Since the halflife of C14 is known, the amount of time elapsed since the death of an organism can be measured Halflife: decay rate back to N14 C14 halflife = 5730 years (1965) Original rate = 5568 years (1950 Libby) Start with 15 cpmgm Sample 5730 years old (7.5 cpmgram) half left
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