Accelerator mass spectrometry of 14C at Nagoya University

Nakai, Nobuyuki; Nakamura, Toshio; Kimura, Motohiro; Sakase, T.; Sato, Shoki; Sakai, A.

doi:10.1016/0168-583x(84)90504-4

Cited by 19 publications

(6 citation statements)

References 13 publications

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“…We measured the 14C/13C ratio, b14C(13), in the Tandetron spectrometer at the Dating and Materials Research Center, Nagoya University (Nakai et al 1984;Nakamura, Nakai & Ohishi 1987) b14C(13) = ((14C/13C)\sample/(14C/13C)stafldd -1) X 1000 (%o).…”

Section: Introductionmentioning

confidence: 99%

Measurement of ¹⁴C Concentrations of Stratospheric CO₂ by Accelerator Mass Spectrometry

et al. 1992

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ABSTRACT. In order to measure the concentrations of anthropogenically influenced gases in the stratosphere, we have collected air samples from the lower stratosphere since 1985, by a balloon-borne cryogenic sampling method, developed at the Institute of Space and Astronautical Science (ISAS). Air samples of -16 liters at STP were collected in the stratosphere at altitudes from 18.6 to 30.4 km, over the northeastern part of Japan (39.5°N,139-142°E), on 1 September 1989. We conducted 14C analyses to study the vertical and horizontal air-mass movement in the stratosphere, and to investigate the air transport mechanism between troposphere and stratosphere. Carbon dioxide (containing a few mg carbon) was separated cryogenically from the air samples, and the 14C concentration of the CO2 was measured by a Tandetron accelerator mass spectrometer, using Fe-graphite targets prepared by reducing CO2 on Fe-powder with hydrogen in a Vycor tube at 650°C. concentrations, higher in the stratosphere than the troposphere, seem to be explained by large bomb-produced 14C inventories and/or high 14C production by cosmic rays, as well as weak vertical mixing of air masses in the stratosphere.

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Section: Introductionmentioning

confidence: 99%

Measurement of ¹⁴C Concentrations of Stratospheric CO₂ by Accelerator Mass Spectrometry

et al. 1992

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“…The resulting CO 2 was purified cryogenically in a high-vacuum preparation system and then converted to graphite by reducing the CO 2 on Fe-powder with hydrogen gas in a sealed Vycor tube at 650 ı C. 14 C ages of samples were measured along with the standard (NIST HOxII) using the Tandetron AMS at the Dating and Materials Research Center, Nagoya University (Nakai et al 1984;Nakamura et al 1987). The Terrestrial macro fossils were sealed in an evacuated Vycor tube with CuO, and combusted at 850 ı C in an electronic furnace.…”

Section: Methodsmentioning

confidence: 99%

Earth Surface Processes and Environmental Changes in East Asia

Kashiwaya¹,

Shen²,

Kim³

2015

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“…The graphite targets were used for 14C measurements with a Tandetron accelerator mass spectrometer (TAMS) at the Dating and Materials Research Center, Nagoya University. Nakai et al (1984) and Nakamura, Nakai and Ohishi (1987) described our procedure for TAMS 14C measurements.…”

Section: °Cmentioning

confidence: 99%

A Batch Preparation Method for Graphite Targets With Low Background for AMS ¹⁴C Measurements

et al. 1993

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Accelerator mass spectrometry of 14C at Nagoya University

Cited by 19 publications

References 13 publications

Measurement of ¹⁴C Concentrations of Stratospheric CO₂ by Accelerator Mass Spectrometry

Measurement of ¹⁴C Concentrations of Stratospheric CO₂ by Accelerator Mass Spectrometry

Earth Surface Processes and Environmental Changes in East Asia

A Batch Preparation Method for Graphite Targets With Low Background for AMS ¹⁴C Measurements

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Accelerator mass spectrometry of 14C at Nagoya University

Cited by 19 publications

References 13 publications

Measurement of 14C Concentrations of Stratospheric CO2 by Accelerator Mass Spectrometry

Measurement of 14C Concentrations of Stratospheric CO2 by Accelerator Mass Spectrometry

Earth Surface Processes and Environmental Changes in East Asia

A Batch Preparation Method for Graphite Targets With Low Background for AMS 14C Measurements

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Measurement of ¹⁴C Concentrations of Stratospheric CO₂ by Accelerator Mass Spectrometry

Measurement of ¹⁴C Concentrations of Stratospheric CO₂ by Accelerator Mass Spectrometry

A Batch Preparation Method for Graphite Targets With Low Background for AMS ¹⁴C Measurements