Browsing by Author "Jull A.J.T."
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Browsing by Author "Jull A.J.T."
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Jull A.J.T.; Cloudt S.; Donahue D.J.; Sisterson J.M.; Reedy R.C.; Masarik J. (1998)Accelerator mass spectrometry (AMS) was used to measure the activity vs. depth profiles of 14C produced by both solar cosmic rays (SCR) and galactic cosmic rays (GCR) in Apollo 15 lunar cores 15001-6 and 15008, Apollo 17 ...
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Lifton N.A.; Jull A.J.T.; Quade J. (2001)The potential of in situ cosmogenic 14C (in situ 14C) for surficial process studies is widely recognized, yet a reliable means of isolating it has proved difficult to develop. We present here a new method for extracting ...
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Leya I.; Wieler R.; Aggrey K.; Herzog G.F.; Schnabel C.; Metzler K.; Hildebrand A.K.; Bouchards M.; Jull A.J.T.; Andrews H.R.; Wang M.-S.; Ferko T.E.; Lipschutz M.E.; Wacker J.F.; Neumann S.; Michel R. (2001)The compositionally typical H5 chondrite St-Robert has an exposure age, 7.8 Ma, indistinguishable from that of the main cluster of H chondrites. Small values of the cosmogenic 22Ne/21Ne ratio in interior samples imply a ...
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Lal D.; Jull A.J.T. (2003)We present estimates of ''realizable'' influx of selected cosmogenic isotopes, 3He, 10Be, 26Al, and 14C, and platinum group elements, Ir, Os, and Re on the earth via influx of meteoroids. We define realizable as the ...
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Heisinger B.; Knie K.; Nolte E.; Lal D.; Jull A.J.T.; Kubik P.; Ivy-Ochs S. (2002)We have determined the production yields for radionuclides in Al2O3, SiO2, S, Ar, K2SO4, CaCO3, Fe, Ni and Cu targets, which were irradiated with slow negative muons at the Paul Scherrer Institute in Villigen (Switzerland). ...
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Polyak L.; Lehman S.J.; Gataullin V.; Jull A.J.T. (1995)Marine geologic evidence from the western Barents Sea shelf leaves little doubt that the area was covered by grounded ice during the last glaciation, but the pattern and timing of the subsequent deglaciation were not well ...
Now showing items 1-6 of 6