Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Alan R. Gagnon"'
Autor:
Ulrich M Hanke, Alan R Gagnon, Christopher M Reddy, Mary C Lardie Gaylord, Anne J Cruz, Valier Galy, Roberta L Hansman, Mark D Kurz
Publikováno v:
Radiocarbon. 65:389-409
Sequential thermal analysis allows for deconvoluting the refractory nature and complexity of carbon mixtures embedded in mineral matrices for subsequent offline stable carbon and radiocarbon (14C) isotope analyses. Originally developed to separate Ho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5def7dde1171aa94ae3aa0e7f8c2f61a
https://doi.org/10.1017/rdc.2023.13
https://doi.org/10.1017/rdc.2023.13
Publikováno v:
Radiocarbon. 64:195-199
This note describes improvements of UV oxidation method that is used to measure carbon isotopes of dissolved organic carbon (DOC) at the National Ocean Sciences Accelerator Mass Spectrometry Facility (NOSAMS). The procedural blank is reduced to 2.6
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d4faa79bec5005fc42d7de671965f6c
https://doi.org/10.1017/rdc.2022.4
https://doi.org/10.1017/rdc.2022.4
Autor:
Mark L. Roberts, Alan R. Gagnon, Trista J. Vick-Majors, Kathy Kasic, Wei Li, Billy Collins, Mark D. Kurz, Brad E. Rosenheim, Ryan A Venturelli, John C. Priscu
Publikováno v:
Radiocarbon. 63:1555-1568
Radiocarbon (14C) is an isotopic tracer used to address a wide range of scientific research questions. However, contamination by elevated levels of 14C is deleterious to natural-level laboratory workspaces and accelerator mass spectrometer facilities
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e87742c60992b24ef1f847eaf4607cc8
https://doi.org/10.1017/rdc.2021.55
https://doi.org/10.1017/rdc.2021.55
Autor:
William J. Jenkins, Alan R. Gagnon, Mark L. Roberts, Li Xu, Brett E. Longworth, Joshua D. Hlavenka, Kathryn L. Elder
Publikováno v:
Radiocarbon. 61:1403-1411
Replicate radiocarbon (14C) measurements of organic and inorganic control samples, with known Fraction Modern values in the range Fm = 0–1.5 and mass range 6 μg–2 mg carbon, are used to determine both the mass and radiocarbon content of the blan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92b5d0962164af022ad0cba99dc7edca
https://doi.org/10.1017/rdc.2019.74
https://doi.org/10.1017/rdc.2019.74
Publikováno v:
Geochemistry, Geophysics, Geosystems. 22
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e31f2925ec25a22beed31fdc3df64564
https://doi.org/10.1029/2020gc009472
https://doi.org/10.1029/2020gc009472
Autor:
Alan R. Gagnon, Guillaume Soulet, Prosper K. Zigah, Katherine E. Grant, Sarah Z. Rosengard, Jordon D. Hemingway, Valier Galy, Ann P. McNichol
Publikováno v:
Radiocarbon. 59:179-193
We estimate the blank carbon mass over the course of a typical Ramped PyrOx (RPO) analysis (150–1000°C; 5°C×min–1) to be (3.7±0.6) μg C with an Fm value of 0.555±0.042 and a δ13C value of (–29.0±0.1) ‰ VPDB. Additionally, we provide e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a370264c24fafa6cf5df924caa1489d
https://doi.org/10.1017/rdc.2017.3
https://doi.org/10.1017/rdc.2017.3
Publikováno v:
Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating
We designed and developed a system to efficiently extract dissolved inorganic carbon (DIC) from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) utilizes a gas-permeable polym
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e59a5db21dae2d3cf30c40c0d1682bdb
https://doi.org/10.1002/lom3.10066
https://doi.org/10.1002/lom3.10066
Autor:
Alan R. Gagnon, Lloyd D Keigwin
Publikováno v:
Radiocarbon. 57:123-128
The radiocarbon activity of benthic foraminifera was investigated in surface sediments from a high deposition rate location at a depth of 1000 m in the Okhotsk Sea. Sediments were preserved and stained with Rose Bengal to identify foraminifera that c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39b1ac63b6287f80bd9c7069c86fc110
https://doi.org/10.2458/azu_rc.57.18153
https://doi.org/10.2458/azu_rc.57.18153
Autor:
Sunita R. Shah Walter, Mary C. Lardie Gaylord, Elizabeth Klein, Mark L. Roberts, Alan R. Gagnon, Ann P. McNichol
Publikováno v:
Radiocarbon. 57:109-122
In response to the increasing demand for 14C analysis of samples containing less than 25 μg C, ultra-small graphitization reactors with an internal volume of ∼0.8 mL were developed at NOSAMS. For samples containing 6 to 25 μg C, these reactors co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::22e4fbe2dc808fead098719df6457920
https://doi.org/10.2458/azu_rc.57.18118
https://doi.org/10.2458/azu_rc.57.18118
Publikováno v:
Analytical Chemistry. 81:6310-6316
A compound specific radiocarbon analysis method was developed to evaluate the 14C composition of atmospheric formaldehyde. In this method, gaseous formaldehyde was collected with a high-volume air sampler using glass-fiber filters pretreated with sod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3255d788501c260112301e240a9f941a
https://doi.org/10.1021/ac9004666
https://doi.org/10.1021/ac9004666