Determination of the half-life of 233Pa

Usman, K.; MacMahon, T. D.

doi:10.1016/s0969-8043(99)00214-6

Cited by 24 publications

(6 citation statements)

References 5 publications

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“…The protactinium isotope used was 233 Pa, a ␤-emitter with a half-life of 27.0 d (Usman and MacMahon, 2000). The emitted electron has a maximum energy of 0.6 MeV.…”

Section: Thorium and Protactinium Spikesmentioning

confidence: 99%

Adsorption of thorium and protactinium onto different particle types: experimental findings 1 1Associate editor: S. Krishnaswami

Geibert

Usbeck

2004

Geochimica et Cosmochimica Acta

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“…The protactinium isotope used was 233 Pa, a ␤-emitter with a half-life of 27.0 d (Usman and MacMahon, 2000). The emitted electron has a maximum energy of 0.6 MeV.…”

Section: Thorium and Protactinium Spikesmentioning

confidence: 99%

Adsorption of thorium and protactinium onto different particle types: experimental findings 1 1Associate editor: S. Krishnaswami

Geibert

Usbeck

2004

Geochimica et Cosmochimica Acta

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“…iii. Denmark Strait Overflow Water (DSOW) is formed after the Nordic Sea deep waters overflow and entrain Atlantic waters (SPMW and LSW) (Yashayaev and Dickson, 2008) with dense Greenland shelf water cascading down to the DSOW layer in the Irminger Sea (Falina et al, 2012;Olsson et al, 2005;Tanhua et al, 2005). This water occupies the deepest part of the IR and LA seas.…”

Section: Water Mass Distribution and Influencementioning

confidence: 99%

“…The 233 Pa spike was freshly made by milking from 237 Np (following Regelous et al, 2004) and calibrated against a known 236 U solution after the complete decay of 233 Pa to 233 U, i.e. four to five half-lives of 233 Pa (t 1/2 = 26.98 days; Usman and MacMahon, 2000) after spike production (Robinson et al, 2004); 50 mg of pure Fe as a chloride solution was also added to each water sample. Samples were left overnight to allow for spike equilibrium, after which the pH was raised to ∼ 8.5 using distilled NH 4 OH to coprecipitate the actinides with insoluble Fe-oxyhydroxides.…”

Section: Introductionmentioning

confidence: 99%

Evolution of <sup>231</sup>Pa and <sup>230</sup>Th in overflow waters of the North Atlantic

Deng¹,

Henderson²,

Castrillejo³

et al. 2018

Biogeosciences

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Abstract. Many palaeoceanographic studies have sought to use the 231Pa∕230Th ratio as a proxy for deep ocean circulation rates in the North Atlantic. As of yet, however, no study has fully assessed the concentration of, or controls on, 230Th and 231Pa in waters immediately following ventilation at the start of Atlantic meridional overturning. To that end, full water-column 231Pa and 230Th concentrations were measured along the GEOVIDE section, sampling a range of young North Atlantic deep waters. 230Th and 231Pa concentrations in the water column are lower than those observed further south in the Atlantic, ranging between 0.06 and 12.01 µBq kg−1 and between 0.37 and 4.80 µBq kg−1, respectively. Both 230Th and 231Pa profiles generally increase with water depth from surface to deep water, followed by decrease near the seafloor, with this feature most pronounced in the Labrador Sea (LA Sea) and Irminger Sea (IR Sea). Assessing this dataset using extended optimum multi-parameter (eOMP) analysis and CFC-based water mass age indicates that the low values of 230Th and 231Pa in water near the seafloor of the LA Sea and IR Sea are related to the young waters present in those regions. The importance of water age is confirmed for 230Th by a strong correlation between 230Th and water mass age (though this relationship with age is less clear for 231Pa and the 231Pa∕230Th ratio). Scavenged 231Pa and 230Th were estimated and compared to their potential concentrations in the water column due to ingrowth. This calculation indicates that more 230Th is scavenged (∼80 %) than 231Pa (∼40 %), consistent with the relatively higher particle reactivity of 230Th. Enhanced scavenging for both nuclides is demonstrated near the seafloor in young overflow waters. Calculation of the meridional transport of 230Th and 231Pa with this new GEOVIDE dataset enables a complete budget for 230Th and 231Pa for the North Atlantic. Results suggest that net transport southward of 230Th and 231Pa across GEOVIDE is smaller than transport further south in the Atlantic, and indicate that the flux to sediment in the North Atlantic is equivalent to 96 % of the production of 230Th and 74 % of the production for 231Pa. This result confirms a significantly higher advective loss of 231Pa to the south relative to 230Th and supports the use of 231Pa∕230Th to assess meridional transport at a basin scale.

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“…The half-life is also important in other fields such as microorganism, mineral, energy, resource, astronomy, and meteorology. Of course, half-time is the time required for the reduction of radiation intensity to its half (Usaman and MacMahon, 2000).…”

Section: Introductionmentioning

confidence: 99%

Half-life and half-capacity concentration approach for the adsorption of 2,4-dichlorophenol and methyl blue from water on activated carbons

Tseng

et al. 2011

Journal of the Taiwan Institute of Chemical Engineers

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Determination of the half-life of 233Pa

Cited by 24 publications

References 5 publications

Adsorption of thorium and protactinium onto different particle types: experimental findings 1 1Associate editor: S. Krishnaswami

Adsorption of thorium and protactinium onto different particle types: experimental findings 1 1Associate editor: S. Krishnaswami

Evolution of <sup>231</sup>Pa and <sup>230</sup>Th in overflow waters of the North Atlantic

Half-life and half-capacity concentration approach for the adsorption of 2,4-dichlorophenol and methyl blue from water on activated carbons

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Determination of the half-life of 233Pa

Cited by 24 publications

References 5 publications

Adsorption of thorium and protactinium onto different particle types: experimental findings 1 1Associate editor: S. Krishnaswami

Adsorption of thorium and protactinium onto different particle types: experimental findings 1 1Associate editor: S. Krishnaswami

Evolution of &lt;sup&gt;231&lt;/sup&gt;Pa and &lt;sup&gt;230&lt;/sup&gt;Th in overflow waters of the North Atlantic

Half-life and half-capacity concentration approach for the adsorption of 2,4-dichlorophenol and methyl blue from water on activated carbons

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Evolution of <sup>231</sup>Pa and <sup>230</sup>Th in overflow waters of the North Atlantic