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| 001 | 852442 | ||
| 005 | 20240708134001.0 | ||
| 037 | _ | _ | |a FZJ-2018-05388 |
| 100 | 1 | _ | |a Brandt, Felix |0 P:(DE-Juel1)144040 |b 0 |e Corresponding author |u fzj |
| 111 | 2 | _ | |a Goldschmidt |c Boston |d 2018-08-12 - 2018-08-17 |w USA |
| 245 | _ | _ | |a Ra Uptake by the Sr-Rich Solid Solution of (Sr, Ba)SO4 |
| 260 | _ | _ | |c 2018 |
| 336 | 7 | _ | |a Conference Paper |0 33 |2 EndNote |
| 336 | 7 | _ | |a Other |2 DataCite |
| 336 | 7 | _ | |a INPROCEEDINGS |2 BibTeX |
| 336 | 7 | _ | |a conferenceObject |2 DRIVER |
| 336 | 7 | _ | |a LECTURE_SPEECH |2 ORCID |
| 336 | 7 | _ | |a Conference Presentation |b conf |m conf |0 PUB:(DE-HGF)6 |s 1537347937_29575 |2 PUB:(DE-HGF) |x Other |
| 520 | _ | _ | |a Solid solution formation is an important mechanism of radionuclide uptake by mineral phases which is favored in natural systems due to a lowered configurational entropy. Recent studies have shown that the formationof a (Ba,Ra)SO4 solid solution significantly reduces the solubility of 226Ra in aqueous systems. This result is very relevant for the direct disposal of spent nuclear fuel in a deep geological formation, where 226Ra would dominate the dose after 100,000 years [1]. In natural systems SrSO4 often occurs along with BaSO4 implying that Ra-uptake should be assessed within the system of (Sr,Ba,Ra)SO4 + H2O. A recent thermodynamic modelling study [2] predicted a significant uptake of Ra into the ternary (Sr,Ba,Ra)SO4 solid-solution. Here we present results of long-term batch-recristallisation experiments on Ra-uptake in a Sr-rich part of the ternary system. A mechanical mixture of celestite with a small amount of barite and a (Sr,Ba)SO4 solid solution of equivalent comoposition were put into a contact with 226Ra,aq. We observed a significant uptake of 226Ra in both cases proceeding via the formation of the minor ternary Sr-, Ba- and Ra-rich phase within the major Sr-rich phase. In longer experiments the ternary phase disappeared leading to the formation of a mixture of Sr- and Ba-rich phases, within which Ra could not be detected by scanning transmission electron microscopy-energy-dispersive X-ray spetroscopy (STEM-EDX). The final 226Ra concentrations in both experiments were similar and close to predicted levels. The formation of the intermediate phase is interpreted based on structural and kinetic considerations. [1] Norrby, S. et al. (1997). “SKI SITE-94 Saekerhetsanalys foer Djupfoervar iett Kristallint berg”.Stockholm, Sweden. [2] Vinograd et al. (2018). Applied Geochemistry, in press. |
| 536 | _ | _ | |a 161 - Nuclear Waste Management (POF3-161) |0 G:(DE-HGF)POF3-161 |c POF3-161 |f POF III |x 0 |
| 700 | 1 | _ | |a Klinkenberg, Martina |0 P:(DE-Juel1)130364 |b 1 |u fzj |
| 700 | 1 | _ | |a Poonoosamy, Jenna |0 P:(DE-Juel1)169154 |b 2 |u fzj |
| 700 | 1 | _ | |a Barthel, Juri |0 P:(DE-Juel1)130525 |b 3 |u fzj |
| 700 | 1 | _ | |a Weber, Juliane |0 P:(DE-Juel1)157607 |b 4 |
| 700 | 1 | _ | |a Bosbach, Dirk |0 P:(DE-Juel1)130324 |b 5 |u fzj |
| 909 | C | O | |o oai:juser.fz-juelich.de:852442 |p VDB |
| 910 | 1 | _ | |a Forschungszentrum Jülich |0 I:(DE-588b)5008462-8 |k FZJ |b 0 |6 P:(DE-Juel1)144040 |
| 910 | 1 | _ | |a Forschungszentrum Jülich |0 I:(DE-588b)5008462-8 |k FZJ |b 1 |6 P:(DE-Juel1)130364 |
| 910 | 1 | _ | |a Forschungszentrum Jülich |0 I:(DE-588b)5008462-8 |k FZJ |b 2 |6 P:(DE-Juel1)169154 |
| 910 | 1 | _ | |a Forschungszentrum Jülich |0 I:(DE-588b)5008462-8 |k FZJ |b 3 |6 P:(DE-Juel1)130525 |
| 910 | 1 | _ | |a Forschungszentrum Jülich |0 I:(DE-588b)5008462-8 |k FZJ |b 5 |6 P:(DE-Juel1)130324 |
| 913 | 1 | _ | |a DE-HGF |l Nukleare Entsorgung und Sicherheit sowie Strahlenforschung |1 G:(DE-HGF)POF3-160 |0 G:(DE-HGF)POF3-161 |2 G:(DE-HGF)POF3-100 |v Nuclear Waste Management |x 0 |4 G:(DE-HGF)POF |3 G:(DE-HGF)POF3 |b Energie |
| 914 | 1 | _ | |y 2018 |
| 920 | 1 | _ | |0 I:(DE-Juel1)IEK-6-20101013 |k IEK-6 |l Nukleare Entsorgung und Reaktorsicherheit |x 0 |
| 920 | 1 | _ | |0 I:(DE-Juel1)ER-C-2-20170209 |k ER-C-2 |l Materialwissenschaft u. Werkstofftechnik |x 1 |
| 980 | _ | _ | |a conf |
| 980 | _ | _ | |a VDB |
| 980 | _ | _ | |a I:(DE-Juel1)IEK-6-20101013 |
| 980 | _ | _ | |a I:(DE-Juel1)ER-C-2-20170209 |
| 980 | _ | _ | |a UNRESTRICTED |
| 981 | _ | _ | |a I:(DE-Juel1)IFN-2-20101013 |
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