C1403.2006.Week_Six.2.POST

C1403.2006.Week_Six.2.POST - Shroud of Turin Is the...

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Unformatted text preview: Shroud of Turin Is the religious relic known as the Shroud of Turin the burial cloth of Jesus? Image appears to that of a bearded... perhaps crucified figure of a male. Radioactive Decay Rutherford discovered that decay rates for radioactive elements (as measured by - and - emission) were not constant: Rates decreased exponentially with time, describing statistical processes random events If twice the nuclei present, then twice the number of decays per unit time Kinetic process of the first order N products rate = N/ t = - N N = # of nuclei present at time t Radioactive Decay is Exponential fraction remaining at time multiples of t 1/2 General description of a first order (exponential) nuclear decay process rate = ! N ! t " # $ % = dN dt = & N N = N e ! " t N N = e ! " t ln N N = ! " t ln N N = ! t ln 1 .5 = ! t 1 2 t 1 2 = 0.693 ! ln N N = ! t Radioactive Decay Radiocarbon dating 14 C 6 14 N 7 + + | | antineutrino t 1/2 = 5730 y 14 C 6 is produced in the upper atmosphere via neutron bombardment: 14 N 7 + 1 n 14 C 6 + 1 H 1 The isotopes of carbon equilibrate at sea level over a period estimated to be about 500 years.estimated to be about 500 years....
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C1403.2006.Week_Six.2.POST - Shroud of Turin Is the...

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