A new compact AMS facility at the Dongguk University

Lee, Sang-Hun; Park, Sae-Hoon; Kong, Min-Ji; Kim, Yu-Seok

doi:10.1016/j.nimb.2019.12.027

Cited by 6 publications

(8 citation statements)

References 7 publications

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“…In addition, the measured δ 13 C values were also consistent with the reference values for OX-II, IAEA-C7 and IAEA-C8, indicating that the MICADAS was stable and reliable for measurement of the prepared samples. The measured pMC values for OXII, IAEA-C7, and IAEA-C8 by MICADAS at Lanzhou University were found to be comparable with the values obtained by Dongguk University (Republic of Korea) (Lee et al 2020), and the Centro Nacional de Aceleradores (Spain) (Guerra et al 2019). The background level for the MICADAS at Lanzhou University was also found to be comparable with the AMS value reported by Beijing University (Liu et al 2007).…”

Section: Accelerator Mass Spectrometersupporting

confidence: 80%

Performance and Inter-Comparison Tests of the Micadas at the Radiocarbon Laboratory of Lanzhou University, China

Cao

Wang

et al. 2022

Radiocarbon

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Since 2018, the radiocarbon laboratory of Lanzhou University has been equipped with a compact accelerator mass spectrometer—a 200-KV mini carbon dating system (MICADAS), together with an auto graphitization equipment (AGE III). The laboratory has for a long time prepared graphite targets for 14C dating of plant fossils, charcoal, bones, and bulk organic matter. Herein, we give an overview of the operating status and performance of the dating facility. The long-term measurements of the standard and blank samples indicated that the results for MICADAS in Lanzhou University were accurate and stable and of high sensitivity. Fifteen sets of organic materials collected from archaeological sites in northwest China were selected for an inter-comparison study involving the participation of four specialist laboratories. The 14C dating results for the homogenized archaeological samples from several of the laboratories showed a high degree of consensus. The long-term performance and inter-comparison data for MICADAS confirmed that the radiocarbon laboratory of Lanzhou University could provide stable and accurate 14C dating results. In this context, the 14C dating results for a number of key archaeological/environmental samples were validated.

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Section: Accelerator Mass Spectrometersupporting

confidence: 80%

Performance and Inter-Comparison Tests of the Micadas at the Radiocarbon Laboratory of Lanzhou University, China

Cao

Wang

et al. 2022

Radiocarbon

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“…Although AMS is widely considered the standard method with the highest precision, it requires large, highly sophisticated, and expensive analytical facilities with high operating costs. Recently, some efforts have been made to make AMS more economical by reducing equipment size and associated costs. − Several emerging analytical alternatives have shown potential to address these challenges and may be applicable in coprocessing.…”

Section: Advanced Methods For Tracking Biogenic Carbonmentioning

confidence: 99%

Online Biogenic Carbon Analysis Enables Refineries to Reduce Carbon Footprint during Coprocessing Biomass- and Petroleum-Derived Liquids

et al. 2021

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To mitigate green-house gas (GHG) emissions, governments around the world are enacting legislation to reduce carbon intensity in transportation fuels. Coprocessing biomass and petroleum-derived liquids in existing refineries is a near-term, cost-effective approach for introducing renewable carbon in fuels and enabling refineries to meet regulatory mandates. However, coprocessing biomass-derived liquids in refineries results in variable degrees of biogenic carbon incorporation, necessitating accurate quantification to verify compliance with mandates. Existing refinery control and instrumentation systems lack the means to measure renewable carbon accurately, reliably, and quickly. Thus, accurate measurement of biogenic carbon is key to ensuring refineries meet regulatory mandates. In this Perspective, we present existing methods for measuring biogenic carbon, point out their challenges, and discuss the need for new online analytical capabilities to measure biogenic carbon in fuel intermediates.

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“…Pure CO 2 gas was reacted with iron powder and H 2 at 550°C for approximately 3 hr, generating graphite powder along with iron. The graphite samples were pressed into an aluminum cathode using a pneumatic sample press (Ionplus AG, Switzerland) to measure the carbon isotope ratio (Lee et al 2020a(Lee et al , 2020b.…”

Section: Chemical Pretreatment and Graphitizationmentioning

confidence: 99%

“…The samples were measured using a MICADAS accelerator mass spectrometer at Dongguk University (Lee et al 2020a). Oxalic Acid II (NIST-SRM 4990C) samples and IAEA-C1 samples were measured to normalize sample data and check the background of the AMS.…”

Section: Measurements and Calculationsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Spatial Distribution of Radiocarbon in Urban Tree Leaves at Gyeongju, South Korea

Lee

Kong²,

Lee³

et al. 2022

Radiocarbon

Self Cite

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Radiocarbon (14C) in natural samples undergoes changes due to variations in atmospheric CO2 resulting from anthropogenic activities. To analyze the variation of the 14C ratio in atmospheric CO2, deciduous tree leaves were collected in Gyeongju, a popular tourist city in South Korea. Leaf samples were collected from Prunus subg. Cerasus trees at five different sampling points throughout the city over 3 years (2018, 2020, and 2021). The 14C data of the samples were categorized into three groups (downtown, rural, and tourist sites) and analyzed for variations among the different years. The 14C ratio at downtown sites was stable after 2018, the rural site ratio increased between 2018 and 2020 and then decreased between 2020 and 2021, and the tourist site ratio increased after 2018. We theorize that the increased 14C ratio at the tourist site was caused by a decrease in tourism after 2018.

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A new compact AMS facility at the Dongguk University

Cited by 6 publications

References 7 publications

Performance and Inter-Comparison Tests of the Micadas at the Radiocarbon Laboratory of Lanzhou University, China

Performance and Inter-Comparison Tests of the Micadas at the Radiocarbon Laboratory of Lanzhou University, China

Online Biogenic Carbon Analysis Enables Refineries to Reduce Carbon Footprint during Coprocessing Biomass- and Petroleum-Derived Liquids

Recent Spatial Distribution of Radiocarbon in Urban Tree Leaves at Gyeongju, South Korea

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