Dissolution of ThO2: Study of dissolution process with initial 229Th spike

Emmi Myllykylä; Tiina Lavonen; Lauri Koivula; Kaija Ollila; Marja Siitari-Kauppi

doi:10.1007/s10967-016-4991-2

Dissolution of ThO₂: Study of dissolution process with initial ²²⁹Th spike

Emmi Myllykylä
, Tiina Lavonen
, Lauri Koivula
, Kaija Ollila
, Marja Siitari-Kauppi

University of Helsinki

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

Abstract

The sparingly soluble ThO₂ dissolution behaviour was studied under conditions that are expected to prevail in bedrock after the closure of the spent nuclear fuel disposal facility. The objective was to investigate the characteristics of initial dissolution of crystalline ²³²ThO₂ by adding ²²⁹Th tracer to the aqueous phase in the beginning of the 534 days experiment.The evolution of ²³²Th concentration and ²²⁹Th/²³²Th ratio were followed by sector field ICP-MS (inductively coupled plasma mass spectrometer). Selected samples were measured also by alpha spectrometry to compare the results from the used analysis techniques and they gave comparable results. In the early stage of dissolution there was no significant control by chemical equilibrium and the dissolution process seemed to be controlled by the stability of surfaces.

Original language	English
Pages (from-to)	225-235
Journal	Journal of Radioanalytical and Nuclear Chemistry
Volume	311
Issue number	1
DOIs	https://doi.org/10.1007/s10967-016-4991-2
Publication status	Published - 1 Jan 2017
MoE publication type	A1 Journal article-refereed

Funding

This study has been part of REDUPP project. The research leading to these results has received funding from the European Atomic Energy Community's Seventh Framework program (FP7) under grant agreement No. 269903. We thank also safir2018 and YTERA doctoral school for funding this study.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 12 Responsible Consumption and Production

Keywords

ThO2
232Th
229Th
dissolution
ICP-MS
alpha spectrometry
Th
ThO

Access to Document

10.1007/s10967-016-4991-2

Cite this

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title = "Dissolution of ThO2: Study of dissolution process with initial 229Th spike",

abstract = "The sparingly soluble ThO2 dissolution behaviour was studied under conditions that are expected to prevail in bedrock after the closure of the spent nuclear fuel disposal facility. The objective was to investigate the characteristics of initial dissolution of crystalline 232ThO2 by adding 229Th tracer to the aqueous phase in the beginning of the 534 days experiment.The evolution of 232Th concentration and 229Th/232Th ratio were followed by sector field ICP-MS (inductively coupled plasma mass spectrometer). Selected samples were measured also by alpha spectrometry to compare the results from the used analysis techniques and they gave comparable results. In the early stage of dissolution there was no significant control by chemical equilibrium and the dissolution process seemed to be controlled by the stability of surfaces. ",

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T1 - Dissolution of ThO2

T2 - Study of dissolution process with initial 229Th spike

AU - Myllykylä, Emmi

AU - Lavonen, Tiina

AU - Koivula, Lauri

AU - Ollila, Kaija

AU - Siitari-Kauppi, Marja

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The sparingly soluble ThO2 dissolution behaviour was studied under conditions that are expected to prevail in bedrock after the closure of the spent nuclear fuel disposal facility. The objective was to investigate the characteristics of initial dissolution of crystalline 232ThO2 by adding 229Th tracer to the aqueous phase in the beginning of the 534 days experiment.The evolution of 232Th concentration and 229Th/232Th ratio were followed by sector field ICP-MS (inductively coupled plasma mass spectrometer). Selected samples were measured also by alpha spectrometry to compare the results from the used analysis techniques and they gave comparable results. In the early stage of dissolution there was no significant control by chemical equilibrium and the dissolution process seemed to be controlled by the stability of surfaces.

AB - The sparingly soluble ThO2 dissolution behaviour was studied under conditions that are expected to prevail in bedrock after the closure of the spent nuclear fuel disposal facility. The objective was to investigate the characteristics of initial dissolution of crystalline 232ThO2 by adding 229Th tracer to the aqueous phase in the beginning of the 534 days experiment.The evolution of 232Th concentration and 229Th/232Th ratio were followed by sector field ICP-MS (inductively coupled plasma mass spectrometer). Selected samples were measured also by alpha spectrometry to compare the results from the used analysis techniques and they gave comparable results. In the early stage of dissolution there was no significant control by chemical equilibrium and the dissolution process seemed to be controlled by the stability of surfaces.

KW - ThO2

KW - 232Th

KW - 229Th

KW - dissolution

KW - ICP-MS

KW - alpha spectrometry

KW - Th

KW - ThO

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U2 - 10.1007/s10967-016-4991-2

DO - 10.1007/s10967-016-4991-2

M3 - Article

SN - 0236-5731

VL - 311

SP - 225

EP - 235

JO - Journal of Radioanalytical and Nuclear Chemistry

JF - Journal of Radioanalytical and Nuclear Chemistry

IS - 1

ER -

Dissolution of ThO₂: Study of dissolution process with initial ²²⁹Th spike

Abstract

Funding

UN SDGs

Keywords

Access to Document

Other files and links

Fingerprint

Investigation of ThO₂ as a structural analogue for spent nuclear fuel dissolution under repository conditions: Dissertation

Cite this

Dissolution of ThO2: Study of dissolution process with initial 229Th spike

Abstract

Funding

UN SDGs

Keywords

Access to Document

Other files and links

Fingerprint

Research output

Investigation of ThO2 as a structural analogue for spent nuclear fuel dissolution under repository conditions: Dissertation

Cite this

Dissolution of ThO₂: Study of dissolution process with initial ²²⁹Th spike

Investigation of ThO₂ as a structural analogue for spent nuclear fuel dissolution under repository conditions: Dissertation