2022
DOI: 10.1016/j.nimb.2022.10.006
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Efficient radiocarbon measurements on marine and terrestrial samples with single stage Accelerator Mass Spectrometry at the Atmosphere and Ocean Research Institute, University of Tokyo

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Cited by 19 publications
(11 citation statements)
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“…Finally, the purified CO 2 samples were reduced to graphite on iron powder using pure hydrogen at 630 $^{\circ}\mathrm{C}$ for 6 hours as described by Yokoyama et al. (2007, 2010), followed by 14 C measurement using the single‐stage accelerator mass spectrometry (AMS) at AORI (Yamane et al., 2019; Yokoyama et al., 2019, 2022b). Results of the 14 C analysis are reported as ∆ 14 C, with the ‰ deviation from the 14 C/ 12 C ratio of a standard with fixed isotopic composition, as defined by Stuiver and Polach (1977).…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Finally, the purified CO 2 samples were reduced to graphite on iron powder using pure hydrogen at 630 $^{\circ}\mathrm{C}$ for 6 hours as described by Yokoyama et al. (2007, 2010), followed by 14 C measurement using the single‐stage accelerator mass spectrometry (AMS) at AORI (Yamane et al., 2019; Yokoyama et al., 2019, 2022b). Results of the 14 C analysis are reported as ∆ 14 C, with the ‰ deviation from the 14 C/ 12 C ratio of a standard with fixed isotopic composition, as defined by Stuiver and Polach (1977).…”
Section: Methodsmentioning
confidence: 99%
“…The DIC ∆ 14 C of seawater is a reliable tracer of water mixing processes (Guilderson et al., 2006; Guilderson & Schrag, 1998; Hirabayashi et al., 2017; Levin & Hesshaimer, 2000; Sweeney et al., 2007). Above‐ground nuclear bomb tests in the Pacific Ocean in the 1940–1960s almost doubled the level of 14 C atoms in the atmosphere compared to that maintained by natural background production rates (Hua et al., 2013, 2022; Yokoyama et al., 2022a, 2022b). Subsequently, a large amount of bomb‐produced 14 C was dissolved in surface water through air‐sea exchange and then gradually penetrated downwards via advection and diffusion.…”
Section: Introductionmentioning
confidence: 98%
“…The age model for the top 225 cm of Core PC01 was obtained through bulk radiocarbon dating using the age-depth modeling program Undatable (Lougheed & Obrochta, 2019). Four sediment samples at a mid-depth of 4, 68, 175, and 225 cm were prepared for analysis following the procedure of Yokoyama et al (2007Yokoyama et al ( , 2010 and measured using the Accelerator Mass Spectrometer at the University of Tokyo (Yokoyama et al, 2019(Yokoyama et al, , 2022. The Marine 20 calibration curve and a marine reservoir effect (ΔR) of 600 ± 250 yr were used.…”
Section: Age-depth Modelmentioning
confidence: 99%
“…Finally, the purified CO2 samples are reduced to graphite using iron powder and pure hydrogen at 630°C for 6 hours, following the method described by Yokoyama et al (2007Yokoyama et al ( , 2010. The DIC Δ 14 C values of these samples were then analyzed using a single stage Accelerator Mass Spectrometer (YS-AMS: National Electrostatic Corporation, SAMS) at the AORI, University of Tokyo (Yamane et al, 2019;Yokoyama et al, 2019Yokoyama et al, , 2022b. 12 C and 13 C are measured as well to correct for isotope fractionation effects.…”
Section: The 14 C Analysismentioning
confidence: 99%
“…The radiocarbon content of DIC (expressed as DIC Δ 14 C) in seawater is recognized as an important tracer in oceanographic studies (Levin & Hesshaimer, 2000;Sweeney et al, 2007;Hirabayashi et al, 2017;Kubota et al, 2022). Following the above-ground nuclear bomb tests in the Pacific Ocean during the 1940s-1960s, a substantial amount of bomb-produced 14 C entered the ocean from the atmosphere through air-sea exchange in surface waters and gradually permeated deeper through water advection and diffusion (Hua et al, 2013(Hua et al, , 2022Yokoyama et al, 2022aYokoyama et al, , 2022b. The characteristics of the DIC Δ 14 C distribution underline its importance for the study of oceanic mixing processes and anthropogenic carbon effects caused by the above-ground nuclear bomb tests.…”
Section: Introductionmentioning
confidence: 99%