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Determination of thorium isotopes in bastnaesite ores

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Abstract

A procedure for the determination of alpha-emitting thorium isotopes in bastnaesite ores has been developed. The refractory sample was completely decomposed by potassium fluoride fusion in a platinum crucible followed by transposition to a pyrosulfate fusion. The pyrosulfate cake was dissolved in HCl and the resulting precipitate dissolved in DTPA solution; thorium was coprecipitated as hydroxide using cerium present in bastnaesite as natural carrier. Thorium was then extracted into a TOPO solution, separated by using Dowex 1-X8 for anionic exchange, electrodeposited and finally analyzed by alpha-spectrometry. Thorium was also determined spectrophotometrically using Arsenazo as a colorimetric reagent. The thorium yield of the above discussed chemical procedure is more than 85%.

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Authors and Affiliations

  1. Corso Stati Uniti, 4, Servizio di Sicurezza del Lavoro e Protezione Sanitaria del CNR, 35020, Padova, (Italy)

    L. Doretti, D. Ferrara & G. Barison

Authors
  1. L. Doretti
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  2. D. Ferrara
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  3. G. Barison
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Doretti, L., Ferrara, D. & Barison, G. Determination of thorium isotopes in bastnaesite ores. Journal of Radioanalytical and Nuclear Chemistry, Articles 134, 343–352 (1989). https://doi.org/10.1007/BF02278272

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  • DOI: https://doi.org/10.1007/BF02278272

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