Half-Lives of Argon-37, Argon-39, and Argon-42

Stoenner, R.W.; Schaeffer, O. A.; Katcoff, S.

doi:10.1126/science.148.3675.1325

Cited by 111 publications

(55 citation statements)

References 8 publications

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“…The five half-life determinations show a tight grouping and give an average value of 35.06 ±0.04 (1σ) days. This value is the same within respective uncertainties of the 37 Ar half-life of 35.1 ±0.1 days reported by Stoenner et al (1965). The average 39 Ar/ 37 Ar correction factor for these five irradiations is 7.43 ±0.21 x10 -4 , which becomes 7.51 ±0.13 x10 -4 if we omit the value for sample 00A, which is considerably lower than the others and possesses the largest uncertainty.…”

Section: A11 Half-life Of 37 Arsupporting

confidence: 50%

“…Measurements of the 37 Ar half-life reported in the literature were all determined by counting the rate of 37 Ar decay, and vary by a few percent. Although most labs that determine Ar-Ar ages use a half-life of 35.1 days as reported by Stoenner et al (1965), past publications of the Chart of the Nuclides have given various half-lives representing averages of different determinations.…”

Section: Acknowledgementsmentioning

confidence: 99%

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Feldspathic clasts in Yamato-86032: Remnants of the lunar crust with implications for its formation and impact history

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Section: A11 Half-life Of 37 Arsupporting

confidence: 50%

Section: Acknowledgementsmentioning

confidence: 99%

Feldspathic clasts in Yamato-86032: Remnants of the lunar crust with implications for its formation and impact history

Nyquist

Bogard

Yamaguchi

et al. 2006

Geochimica et Cosmochimica Acta

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“…The ratio of 39 Ar to 40 Ar is measured to be 8.1×10 −16 g/g [3][4][5] for atmospheric argon. Such a concentration results in 1 Bq/kg of specific activity of 39 Ar (Q = 565 keV, t 1/2 = 269 y [6]). Existing experimental limits on the 42 Ar concentration in the atmosphere are less than 10 −18 42 Ar atoms per 40 Ar atom [7][8][9], which makes about 0.018 Hz/kg of specific activity of 42 Ar (Q = 3520 keV and t 1/2 = 33 y).…”

Section: Introductionmentioning

confidence: 99%

Prediction of underground argon content for dark matter experiments

et al. 2010

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In this paper, we demonstrate the use of physical models to evaluate the production of 39 Ar and 40 Ar underground. Considering both cosmogenic 39 Ar production and radiogenic 40 Ar production in situ and from external sources, we can derive the ratio of 39 Ar to 40 Ar in underground sources. We show for the first time that the 39 Ar production underground is dominated by stopping negative muon capture on 39 K and (α,n) induced subsequent 39 K(n,p) 39 Ar reactions. The production of 39 Ar is shown as a function of depth. We demonstrate that argon depleted in 39 Ar can be obtained only if the depth of the underground resources is greater than 500 m.w.e. below the surface. Stopping negative muon capture on 39 K dominates over radiogenic production at depths of less than 2000 m.w.e., and that production by muon-induced neutrons is subdominant at any depth. The depletion factor depends strongly on both radioactivity level and potassium content in the rock. We measure the radioactivity concentration and potassium concentration in the rock for a potential site of an underground argon source in South Dakota. Depending on the probability of 39 Ar and 40 Ar produced underground being dissolved in the water, the upper limit of the concentration of 39 Ar in the underground water at this site is estimated to be in a range of a factor of 1.6 to 155 less than the 39 Ar concentration in the atmosphere. The calculation tools presented in this paper are also critical to the dating method with 39 Ar.

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“…Another, in principle powerful, age oceanic tracer is the noble gas isotope 39 Ar. Its shorter half-life of 269 years (Stoenner et al, 1965) would even be more suitable to resolve upper ocean gradients for validation of ocean ventilation timescales in models . New measurement techniques allowing for small sample size may enable building a larger 39 Ar database for the ocean (Collon et al, 2004).…”

Section: The Key Process For Anthropogenic Carbon Uptakementioning

confidence: 99%

The ocean carbon sink – impacts, vulnerabilities and challenges

et al. 2015

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Abstract. Carbon dioxide (CO 2 ) is, next to water vapour, considered to be the most important natural greenhouse gas on Earth. Rapidly rising atmospheric CO 2 concentrations caused by human actions such as fossil fuel burning, land-use change or cement production over the past 250 years have given cause for concern that changes in Earth's climate system may progress at a much faster pace and larger extent than during the past 20 000 years. Investigating global carbon cycle pathways and finding suitable adaptation and mitigation strategies has, therefore, become of major concern in many research fields. The oceans have a key role in regulating atmospheric CO 2 concentrations and currently take up about 25 % of annual anthropogenic carbon emissions to the atmosphere. Questions that yet need to be answered are what the carbon uptake kinetics of the oceans will be in the future and how the increase in oceanic carbon inventory will affect its ecosystems and their services. This requires comprehensive investigations, including high-quality ocean carbon measurements on different spatial and temporal scales, the management of data in sophisticated databases, the application of Earth system models to provide future projections for given emission scenarios as well as a global synthesis and outreach to policy makers. In this paper, the current understanding of the ocean as an important carbon sink is reviewed with respect to these topics. Emphasis is placed on the complex interplay of different physical, chemical and biological processes that yield both positive and negative air-sea flux values for natural and anthropogenic CO 2 as well as on increased CO 2 (uptake) as the regulating force of the radiative warming of the atmosphere and the gradual acidification of the oceans. Major future ocean carbon challenges in the fields of ocean observations, modelling and process research as well as the relevance of other biogeochemical cycles and greenhouse gases are discussed.Published by Copernicus Publications on behalf of the European Geosciences Union.

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Half-Lives of Argon-37, Argon-39, and Argon-42

Cited by 111 publications

References 8 publications

Feldspathic clasts in Yamato-86032: Remnants of the lunar crust with implications for its formation and impact history

Feldspathic clasts in Yamato-86032: Remnants of the lunar crust with implications for its formation and impact history

Prediction of underground argon content for dark matter experiments

The ocean carbon sink – impacts, vulnerabilities and challenges

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