Digitale Bibliotheek
Sluiten Bladeren door artikelen uit een tijdschrift
 
Zoeken naar met titel:
ABCDEFGHIJKLMNOPQRSTUVWXYZ

 
<< vorige    volgende >>
     Tijdschrift beschrijving
       Alle jaargangen van het bijbehorende tijdschrift
         Alle afleveringen van het bijbehorende jaargang
           Alle artikelen van de bijbehorende aflevering
                                       Details van artikel 6 van 7 gevonden artikelen
 
 
  New TIMS constraints on the uranium-238 and uranium-234 in seawaters from the main ocean basins and the Mediterranean Sea 1 1 Throughout the paper we use the δ 234U notation which represents the deviation of the measured 234U/238U atomic ratio from the 234U/238U atomic ratio at secular equilibrium: δ 234U=1000×[(234U/238U)/(234U/238U)eq−1], where (234U/238U)eq is the ratio of the two decay constants: λ 238=1.5513×10−10 year−1 (Jaffey et al., 1971) and λ 234=2.826×10−6 year−1 recently revised by Cheng et al. (2000). Therefore, an activity ratio of 1 equals (234U/238U)eq=λ 238/λ 234=54.89×10−6 in atomic ratio. This latter value is ∼3‰ different than the one previously used and thus data from the literature have been recalculated accordingly. All U concentrations are expressed in pmol/g (to be multiplied by 0.2380274 for comparison with some previous works which used ng/g; e.g. Chen et al., 1986).
 
 
Titel: New TIMS constraints on the uranium-238 and uranium-234 in seawaters from the main ocean basins and the Mediterranean Sea 1 1 Throughout the paper we use the δ 234U notation which represents the deviation of the measured 234U/238U atomic ratio from the 234U/238U atomic ratio at secular equilibrium: δ 234U=1000×[(234U/238U)/(234U/238U)eq−1], where (234U/238U)eq is the ratio of the two decay constants: λ 238=1.5513×10−10 year−1 (Jaffey et al., 1971) and λ 234=2.826×10−6 year−1 recently revised by Cheng et al. (2000). Therefore, an activity ratio of 1 equals (234U/238U)eq=λ 238/λ 234=54.89×10−6 in atomic ratio. This latter value is ∼3‰ different than the one previously used and thus data from the literature have been recalculated accordingly. All U concentrations are expressed in pmol/g (to be multiplied by 0.2380274 for comparison with some previous works which used ng/g; e.g. Chen et al., 1986).
Auteur: Delanghe, Doriane
Bard, Edouard
Hamelin, Bruno
Verschenen in: Marine chemistry
Paginering: Jaargang 80 (2002) nr. 1 pagina's 15 p.
Jaar: 2002
Inhoud:
Uitgever: Elsevier Science B.V.
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

                             Details van artikel 6 van 7 gevonden artikelen
 
<< vorige    volgende >>
 
 Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland