Beta Decay of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>26</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Ground State

Samworth, E.A.; Warburton, E.K.; Engelbertink, G.A.P.

doi:10.1103/physrevc.5.138

Cited by 43 publications

(73 citation statements)

References 11 publications

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“…Production mechanisms are from Lifton et al [2005]. Decay constants for 10 Be are from Chmeleff et al [2010], for 26 Al are from Samworth et al [1972], and for 14 C are from Godwin [1962]. Production parameters are appropriate for a sea level, high‐latitude (SLHL) site.…”

Section: Model Descriptionmentioning

confidence: 99%

Steady state reach‐scale theory for radioactive tracer concentration in a simple channel/floodplain system

Lauer

Willenbring

2010

J. Geophys. Res.

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A steady state analytical model is presented for reach‐scale variation in the concentration of a decaying radioactive tracer associated with sediment particles that regularly pass through an off‐channel floodplain. The floodplain is represented as a series of well‐mixed sediment reservoirs that continually exchange sediment with the channel. The model allows for tributary input and valley‐wide aggradation or degradation. Tracer concentration depends on the upstream boundary concentration, the tracer and sediment load, floodplain geometry, and the rates of in‐floodplain tracer production and/or decay. The theory predicts relatively modest down‐channel change in the concentration of long‐lived isotopes but implies that significant change may occur for (1) tracers with a short‐enough half‐life (such as 14C) or (2) floodplains with sediment residence times that are large enough for cosmogenic production or meteoric fallout to increase tracer concentration in the down‐valley direction. The profiles are shown to be strongly dependent on the grain size distributions of both the sediment load and the floodplain. The results imply that down‐channel 14C profiles have the potential to constrain Holocene bed material loads in systems with sufficient storage. The theory concisely describes the general importance of a floodplain for modifying in situ produced cosmogenic tracer concentration and can also characterize floodplain importance for fallout radioisotopes (i.e., 10Be, 210Pb, or 7Be) or organic 14C.

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Section: Model Descriptionmentioning

confidence: 99%

Steady state reach‐scale theory for radioactive tracer concentration in a simple channel/floodplain system

Lauer

Willenbring

2010

J. Geophys. Res.

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“…MacPherson et al, 1995;Carlson and Lugmair, 2000;Burkhardt et al, 2008). For reference, the weighted mean of five determinations of the 26 Al halflife (Samworth et al, 1972;Norris et al, 1983;Middleton et al, 1983;Thomas et al, 1984) summarized by Nishiizumi (2004) is 0.715 ± 0.16 Ma, whereas the unweighted mean of these values is 0.720 ± 0.34 Ma (1r standard deviation). A lower value for t 1/2 ( 26 Al) = 0.705 ± 0.024 Ma (Norris et al, 1983) often is used in cosmogenic nuclide studies (cf.…”

Section: Introductionmentioning

confidence: 99%

The distribution of short-lived radioisotopes in the early solar system and the chronology of asteroid accretion, differentiation, and secondary mineralization

Nyquist

Kleine

Shih

et al. 2009

Geochimica et Cosmochimica Acta

117

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“…The half-life of 26 Al is t 1/2 = (7.17 ± 0.17) × 10 5 a, calculated as the weighted mean with standard deviation of the values reported in Samworth et al (1972), Middleton et al (1983), Norris et al (1983), and Thomas et al (1984). 26 Al is also produced in the atmosphere by spallation of argon by highly energetic cosmic rays (hereinafter referred to as meteoric 26 Al), however with a relatively low global production rate reported between Al atoms cm − 2 a − 1 (Lal and Peters, 1967).…”

Section: Introductionmentioning

confidence: 99%

Cosmogenic 26Al in the atmosphere and the prospect of a 26Al/10Be chronometer to date old ice

Auer

Wagenbach

Wild

et al. 2009

Earth and Planetary Science Letters

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Editor: P. DeMenocalKeywords: 26 Al 10 Be accelerator mass spectrometry dating cosmogenic radionuclides Cosmogenic radionuclides in the one-million-year half-life range offer unique possibilities for age determinations in geophysics. In measurements where the radioactive decay is being utilized as a clock, uncertainties in age determinations may be reduced if the ratio of two radioisotopes with different half-lives can be used as a chronometer. In this work we investigate the atomic ratio of atmospheric Be ratios ranging between 0.5 and up to 2 times the atmospheric ratio were found at different locations in this deep ice core. While the cause for the ratios higher than atmospheric remains unexplained so far, the ratios lower than atmospheric may be caused by radioactive decay, allowing a first dating attempt using the 26 Al/ 10 Be ratio. Thus, at an ice depth of 2760 m an approximate date of (6.7 ± 2.6) × 10 5 years was established.

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Beta Decay of theAl26Ground State

Cited by 43 publications

References 11 publications

Steady state reach‐scale theory for radioactive tracer concentration in a simple channel/floodplain system

Steady state reach‐scale theory for radioactive tracer concentration in a simple channel/floodplain system

The distribution of short-lived radioisotopes in the early solar system and the chronology of asteroid accretion, differentiation, and secondary mineralization

Cosmogenic 26Al in the atmosphere and the prospect of a 26Al/10Be chronometer to date old ice

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