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Unformatted text preview: 2 /day? All radioactive processes occur by first order kinetics. Hence, (6) How many atoms of U236 remain after (t 1/2 = 2.30x10 7 years) 10,000 years if the initial sample contains 1.00x10 12 atoms? (7) A sample of human skull shows a C14 / C12 ratio of 95.6% of that of a living skull. How old is the skull? (t 1/2 C14 = 5730 years) (8) I measure the α particle emission from a radioactive element as 1.02x10 3 /s. I measure it again 24.0 hours later and find it has decreased to 8.52x10 2 /s. What is the halflife of the element? (9) A smoke detector is considered unreliable when 10% of its 0.20ug sample of Americium241 has decayed. How long will this take if the halflife for Am241 is 432 years?...
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This note was uploaded on 09/25/2010 for the course CHEM 123 taught by Professor Piao during the Spring '10 term at Aarhus Universitet.
 Spring '10
 piao
 Chemistry, Proton

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