Accelerator mass spectrometry of 10Be, 14C, 26Al, 36Cl, 41Ca, 129I

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The cosmogenic nuclides measured by AMS at PRIME Lab include 10Be,14C, 26Al, 36Cl, 41Ca and 129I. They are produced in meteorites and other extraterrestrial materials by intense cosmic radiation with target materials, in the Earth's atmosphere by cosmic ray spallation of target elements (Garden variety), and on the solid surface of the earth by cosmic ray spallation, thermal neutron and muon captures, and other nuclear reactions with principal target atoms. In addition, nuclear weapon tests and nuclear fuel reprocessing also produce 10Be , 14C, 36Cl and 129I. Table 1 shows some cosmgenic nuclides with half-lives and major targets


Table 1. Major cosmogenic nuclides

Nuclide Half-life (yr)Major targets () = in atmosphere
14C5,730O, Mg, Si, Fe (N)
41Ca 1.04 x 105Ca, Ti, Fe
36Cl 3.01 x 105Cl, K, Ca, Fe,Ti, (Ar)
26Al 7.05 x 105Si, Al, Fe, (Ar)
10Be 1.36 x 106O, Mg, Si, Fe, (N, O)
53Mn 3.7 x 106Fe
129I 1.56 x 107Te, Ba, La, Ce, (Xe)

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