Zobrazeno 1 - 10
of 24
pro vyhledávání: '"L. R. McHargue"'
Autor:
J.T. Jull, G.S. Burr, J.W. Beck, D.J. Donahue, D. Biddulph, A. L. Hatheway, T. E. Lange, L. R. McHargue
Publikováno v:
The Scientific World Journal, Vol 2, Pp 1579-1593 (2002)
There are many diverse uses of accelerator mass spectrometry (AMS). 14C studies at our laboratory include much research related to paleoclimate, with 14C as a tracer of past changes in environmental conditions as observed in corals, marine sediments,
Externí odkaz:
https://doaj.org/article/3a939332d4a8417c9da3802dcd46d84a
Autor:
Sarah E. LaMOTTA, Jeffrey A. Johnson, Richard C. Greenwood, A. W. R. Bevan, Kyeong Ja Kim, L. R. McHargue, Philip A. Bland, A. J. Timothy Jull
Publikováno v:
Meteoritics & Planetary Science. 45:1271-1283
We have investigated the terrestrial ages, or residence times, of 78 meteorites (representing 73 discrete falls recovered in Western Australia, and one from South Australia, using both 14C measurements and also 14C⁄ 10Be. The samples studied includ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce16fc922f433cb1d6812935f6d8b7e3
https://doi.org/10.1111/j.1945-5100.2010.01289.x
https://doi.org/10.1111/j.1945-5100.2010.01289.x
Publikováno v:
Earth and Planetary Science Letters. 296:227-234
Pebble-sized sandstone concretions, cemented by iron and manganese oxides, are found in several semi-arid regions in the world. Although recognized for a long time, their formation mechanisms have not yet been constrained from scientific studies. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68227c3075a3b6c79553c692e303d013
https://doi.org/10.1016/j.epsl.2010.05.002
https://doi.org/10.1016/j.epsl.2010.05.002
Publikováno v:
Quaternary Science Reviews. 28:3448-3458
We report cosmogenic surface exposure 10Be ages of 21 boulders on moraines in the Jeullesh and Tuco Valleys, Cordillera Blanca, Peru (∼10°S at altitudes above 4200 m). Ages are based on the sea-level at high-latitude reference production rate and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6e6d4d6f33abef040ea0f907f78fab8
https://doi.org/10.1016/j.quascirev.2009.10.006
https://doi.org/10.1016/j.quascirev.2009.10.006
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:2225-2228
A NEC 250 kV single stage accelerator mass spectrometer (SSAMS) has been installed along-side our five year old 5 MV spectrometer. The new instrument is intended to take over routine radiocarbon measurement, thereby providing more capacity for our ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a471ef90898358f590805cf489219896
https://doi.org/10.1016/j.nimb.2008.02.085
https://doi.org/10.1016/j.nimb.2008.02.085
Autor:
Colin Maden, Kyeong Ja Kim, Rainer Wieler, Kurt Marti, Sheng Xu, Stewart P.H.T. Freeman, D. Lal, S. Taylor, A. J. T. Jull, C. Schnabel, Robert C. Finkel, A. Grimberg, L. Vacher, L. R. McHargue
Publikováno v:
Meteoritics & Planetary Science. 42:1831-1840
We report on studies of the concentrations of cosmogenic nuclides in the magnetic fraction of cosmic dust particles recovered from the South Pole Water Well (SPWW) and from Greenland. Our results confirm that cosmic dust material from these locations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d9b10f6cc7ceed879ef6f756e758403
https://doi.org/10.1111/j.1945-5100.2007.tb00541.x
https://doi.org/10.1111/j.1945-5100.2007.tb00541.x
Autor:
Yu Tang, George S. Burr, L. R. McHargue, Richard Cruz, A. J. T. Jull, J. Warren Beck, Douglas J. Donahue, D. Biddulph
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 259:149-153
This article presents a detailed explanation of the analytical method used to monitor and quantify measurement uncertainties at the NSF-Arizona Accelerator Mass Spectrometry (AMS) Laboratory. The method is applicable to all of the isotopes measured a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aca6d25205dcf15152d3bd49b1c38b7b
https://doi.org/10.1016/j.nimb.2007.01.301
https://doi.org/10.1016/j.nimb.2007.01.301
Autor:
D. Lal, Robert C. Finkel, L. R. McHargue, L Vacher, Christopher D Charles, A. J. T. Jull, J. N. Goswami
Publikováno v:
Geochimica et Cosmochimica Acta. 70:3275-3289
Here, we provide evidence suggesting that marine (diatom) opal contains not only a high fidelity record of dissolved oceanic concentrations of cosmic ray-produced radionuclides, 10Be and 26Al, but also a record of temporal variations in a large numbe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4580236d1e9fabc341789648f25dbe9e
https://doi.org/10.1016/j.gca.2006.04.004
https://doi.org/10.1016/j.gca.2006.04.004
Autor:
A. J. T. Jull, J. W. Beck, D. Lal, Nathaniel A. Lifton, Todd Lange, George S. Burr, L. R. McHargue, Douglas J. Donahue
Publikováno v:
Global and Planetary Change. 41:309-323
A wide range of climatic, geologic and archeological records can be characterized by measuring their 14 C and 10 Be concentrations, using the accelerator mass spectrometry (AMS). These records are found not only in the traditional sampling sites such
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6eacef16aefc9c07c362ad1c6c40f752
https://doi.org/10.1016/j.gloplacha.2004.01.014
https://doi.org/10.1016/j.gloplacha.2004.01.014
Autor:
J. W. Beck, A. J. T. Jull, Douglas J. Donahue, L. R. McHargue, George S. Burr, D. Biddulph, Todd Lange, A L Hatheway
Publikováno v:
Journal of Environmental Radioactivity. 69:3-19
There are many diverse uses of accelerator mass spectrometry (AMS). Carbon-14 studies at our laboratory include much research related to paleoclimate, both with 14C as a tracer of past changes in environmental conditions as observed in corals, marine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f544d7060ae6d81f8f294148425764f
https://doi.org/10.1016/s0265-931x(03)00083-3
https://doi.org/10.1016/s0265-931x(03)00083-3