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

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

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The sparingly soluble ThO 2 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 232ThO 2 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 languageEnglish
Pages (from-to)225-235
Number of pages11
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume311
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Spectrum Analysis
Dissolution
Spent fuels
Nuclear fuels
Inductively coupled plasma
Mass spectrometers
Spectrometry
Crystalline materials
Experiments

Keywords

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

Cite this

Myllykyla, Emmi ; Lavonen, Tiina ; Koivula, Lauri ; Ollila, Kaija ; Siitari-Kauppi, Marja. / Dissolution of ThO2: study of dissolution process with initial 229Th spike. In: Journal of Radioanalytical and Nuclear Chemistry. 2017 ; Vol. 311, No. 1. pp. 225-235.
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Dissolution of ThO2: study of dissolution process with initial 229Th spike. / Myllykyla, Emmi; Lavonen, Tiina; Koivula, Lauri; Ollila, Kaija; Siitari-Kauppi, Marja.

In: Journal of Radioanalytical and Nuclear Chemistry, Vol. 311, No. 1, 01.01.2017, p. 225-235.

Research output: Contribution to journalArticleScientificpeer-review

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