Preparation of radiochemically pure 79Se and highly precise determination of its half-life

Jörg, Gerhard; Bühnemann, Rolf; Hollas, Simon; Kivel, N.; Kossert, Karsten; Winckel, Stefaan Van; Gostomski, Christoph Lierse von

doi:10.1016/j.apradiso.2010.05.006

Cited by 98 publications

(42 citation statements)

References 28 publications

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“…In the context of nuclear waste disposal, the radioisotope 79 Se is of special concern due to its long half--80 life (3.27 ·•10 5 years (Jorg et al, 2010)) and expected high mobility. It is created in nuclear reactors by the 81 fission of 235 U.…”

Section: Introduction 67mentioning

confidence: 99%

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

Heberling

Vinograd

Polly

et al. 2014

Geochimica et Cosmochimica Acta

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Section: Introduction 67mentioning

confidence: 99%

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

Heberling

Vinograd

Polly

et al. 2014

Geochimica et Cosmochimica Acta

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“…Due to two aspects, the radioisotope 79 Se is of special concern: its long half-life (3.27 · 10 5 a) 19 and the expected high mobility. Selenite (SeO 2− 3 ) anions are retarded only weakly by common mineral surfaces.…”

Section: Introductionmentioning

confidence: 99%

Quantum Chemical Investigation of the Selenite Incorporation into the Calcite (101̅4) Surface

et al. 2017

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Selenium is a common pollutant in soils and aquifers. The radioisotope 79 Se, an abundant fission product of 235 U, is of particular concern in the context of nuclear waste disposal safety due to its long half-life and its expected high mobility in the multi-barrier system around potential nuclear waste disposal sites. Oxidized selenium species are relatively soluble and show only weak adsorption at common mineral surfaces. However, a possible sorption mechanism for selenium in the geosphere is the structural incorporation of selenium(IV) (selenite, SeO 2− 3 ) into calcite (CaCO 3 ).We carried out a detailed quantum chemical study of the incorporation of SeO 2− 3 into the calcite surface and the subsurface layers.As the main result we present the structural changes upon incorporation of selenite (SeO −2 3 ) into the dry and hydrated calcite (1014) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 coefficient D for SeO −2 3 incorporation into the surface and subsurface layers. The results corroborate the recently proposed entrapment model for selenium(IV) coprecipitation with calcite and show that equilibrium incorporation of selenite into calcite may occur in the surface layer, but is practically impossible in subsurface layers or the bulk.2

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“…Se-79 has emerged as one of the most frequently considered nuclides in the safety assessments of high-level radioactive waste disposal, especially in the disposal of pyro-process wastes [1], due to its long half life (t1/2 = 3.0 x10 5~ 1.1x10 6 years) [2][3]. In nature, selenium exists in four different oxidation states, e.g., selenide Se(-II), elemental selenium Se(0), selenite (Se(IV)O3 2-), and selenate (Se(VI)O4 2-), which show very different chemical properties.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Behaviors of Selenium in the Near Field of Repository

Kim¹,

Min²,

Baik³

et al. 2012

Nuclear Engineering and Technology

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Preparation of radiochemically pure 79Se and highly precise determination of its half-life

Cited by 98 publications

References 28 publications

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

Quantum Chemical Investigation of the Selenite Incorporation into the Calcite (101̅4) Surface

Estimation of the Behaviors of Selenium in the Near Field of Repository

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