Accurate Determination of the Absolute 3He/4He Ratio of a Synthesized Helium Standard Gas (Helium Standard of Japan, HESJ): Toward Revision of the Atmospheric 3He/4He Ratio

@article{Mishima2018AccurateDO,
  title={Accurate Determination of the Absolute 3He/4He Ratio of a Synthesized Helium Standard Gas (Helium Standard of Japan, HESJ): Toward Revision of the Atmospheric 3He/4He Ratio},
  author={Kenji Mishima and Hirochika Sumino and Takahito Yamada and Sei Ieki and Naoki Nagakura and Hidetoshi Otono and Hideyuki Oide},
  journal={Geochemistry},
  year={2018},
  volume={19},
  pages={3995 - 4005}
}
The helium standard of Japan, referred to as HESJ, is an interlaboratory standard for the 3He/4He ratio. While the ratio of 3He and 4He of the HESJ was previously determined by a relative comparison to atmospheric helium, the absolute value of the 3He/4He ratio of the HESJ has not been directly determined yet. Therefore, it relies on the early measurements of that of atmospheric helium. The accuracy of the absolute 3He/4He ratios of the atmosphere and other working standards including HESJ is… 

Increasing atmospheric helium due to fossil fuel exploitation

Fossil fuels contain small amounts of helium, which are co-released into the atmosphere together with carbon dioxide. However, a clear build-up of helium in the atmosphere has not previously been

A secretive mechanical exchange between mantle and crustal volatiles revealed by helium isotopes in 13C-depleted diamonds

Fluid inclusions trapped in fast-growing diamonds provide a unique opportunity to examine the origin of diamonds, and the conditions under which they formed. Eclogitic to websteritic diamondites from

Precise Neutron Lifetime Measurement Using Pulsed Neutron Beams at J-PARC

The neutron beta-decay lifetime (∼ 880 s) is an important parameter in the weak interaction of the Standard Model, cosmology, and astrophysics. For example, the neutron lifetime is a parameter which

Neutron lifetime measurement with pulsed cold neutrons

The neutron lifetime has been measured by comparing the decay rate with the reaction rate of $^3$He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator

Improved accuracy in the determination of the thermal cross section of ${}^{14}{\rm N}({\rm n},{\rm p}){}^{14}{\rm C}$ for neutron lifetime measurement

In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated from the neutron decay rate and the incident neutron flux. The flux is obtained by

References

SHOWING 1-10 OF 44 REFERENCES

atmospheric helium isotopic ratio

A recent study of the isotopic ratio of helium (3He/4He) in the terrestrial atmosphere led the individuals who made the investigation to suggest that this ratio is decreasing with time, probably due

Direct determination of the helium 3 content of atmospheric air by mass spectrometry

The Bureau of Mines, Helium Field Operations, in Amarillo, Texas, has developed a method for direct measurement of the helium 3 content of air by mass spectrometry. The helium is preconcentrated by

The atmospheric helium isotope ratio: Is it changing?

We have compared the helium isotope ratio of samples of Pacific marine air collected over the 30‐year period from 1973 to 2003 against a secondary geothermal gas standard and also against a running

The 3He/4He ratio of the new internal He Standard of Japan (HESJ).

We have prepared an artificial mixture of 3He and 4He to be used as an internal standard for precise 3He/4He measurements of terrestrial mantle-derived samples. The mixture is named HESJ (He Standard

Highly Sensitive and Precise Measurement of Helium Isotopes Using a Mass Spectrometer with Double Collector System

A noble gas mass spectrometer equipped with a double collector system for helium isotopes was improved for the purpose of determining noble gas isotopic composition with extremely low concentration

Determination of tritium by mass spectrometric measurement of 3He

A determination of the helium 4 content of near‐surface atmospheric air within the continental United States

The Bureau of Mines, Helium Field Operations, in Amarillo, Texas, has determined the helium 4 content of near-surface atmospheric air within the continental United States. Analysis of 40 atmospheric

Changes in the atmospheric helium isotope ratio over the past 40 years

We have compared the helium isotope ratio in five samples of Pacific marine air spanning the 40 year period between 1973 and 2013 against a secondary gas standard. In a separate experiment we