Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn

W. P. Voorbraak, Tommi Kekki, Tom Serén, M. Van Bockxstaele, J. Wagemans, J. R. W. Woittiez

Research output: Contribution to journalArticleScientificpeer-review

Abstract

An overview is given of practices for “retrospective” dosimetry based on extraction and counting of niobium and manganese present in typical pressure vessel materials.
The main problem of counting structural materials is the overwhelming presence of the nuclide 60Co in the gamma-ray spectra of irradiated materials.
Chemical separation of niobium and manganese is needed to determine the induced 93Nbm and 54Mn activities. Procedures have been developed for retrospective dosimetry applicable at normally equipped radiochemical laboratories.
Chemical separation procedures have been applied followed by determination of the amount of niobium in dissolution after separation. Special attention has been given to the accurate counting of the very weak X rays of 93Nbm. Different techniques have been applied. Advantages, disadvantages, and the accuracy that can be achieved are discussed.
Special attention has been given to the maximum accuracy that can be reached and the minimum amount of niobium that has to be collected to reach this accuracy.
Original languageEnglish
Article numberPaper ID JAI101142
JournalJournal of ASTM International
Volume4
Issue number4
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

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Niobium
Fast Neutrons
Dosimetry
Neutrons
Manganese
Gamma Rays
Pressure vessels
Gamma rays
Isotopes
Dissolution
X-Rays
Pressure
X rays

Cite this

Voorbraak, W. P., Kekki, T., Serén, T., Van Bockxstaele, M., Wagemans, J., & Woittiez, J. R. W. (2007). Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn. Journal of ASTM International, 4(4), [Paper ID JAI101142]. https://doi.org/10.1520/JAI101142
Voorbraak, W. P. ; Kekki, Tommi ; Serén, Tom ; Van Bockxstaele, M. ; Wagemans, J. ; Woittiez, J. R. W. / Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn. In: Journal of ASTM International. 2007 ; Vol. 4, No. 4.
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abstract = "An overview is given of practices for “retrospective” dosimetry based on extraction and counting of niobium and manganese present in typical pressure vessel materials. The main problem of counting structural materials is the overwhelming presence of the nuclide 60Co in the gamma-ray spectra of irradiated materials. Chemical separation of niobium and manganese is needed to determine the induced 93Nbm and 54Mn activities. Procedures have been developed for retrospective dosimetry applicable at normally equipped radiochemical laboratories. Chemical separation procedures have been applied followed by determination of the amount of niobium in dissolution after separation. Special attention has been given to the accurate counting of the very weak X rays of 93Nbm. Different techniques have been applied. Advantages, disadvantages, and the accuracy that can be achieved are discussed. Special attention has been given to the maximum accuracy that can be reached and the minimum amount of niobium that has to be collected to reach this accuracy.",
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Voorbraak, WP, Kekki, T, Serén, T, Van Bockxstaele, M, Wagemans, J & Woittiez, JRW 2007, 'Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn', Journal of ASTM International, vol. 4, no. 4, Paper ID JAI101142. https://doi.org/10.1520/JAI101142

Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn. / Voorbraak, W. P.; Kekki, Tommi; Serén, Tom; Van Bockxstaele, M.; Wagemans, J.; Woittiez, J. R. W.

In: Journal of ASTM International, Vol. 4, No. 4, Paper ID JAI101142, 2007.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Voorbraak, W. P.

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AU - Van Bockxstaele, M.

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AB - An overview is given of practices for “retrospective” dosimetry based on extraction and counting of niobium and manganese present in typical pressure vessel materials. The main problem of counting structural materials is the overwhelming presence of the nuclide 60Co in the gamma-ray spectra of irradiated materials. Chemical separation of niobium and manganese is needed to determine the induced 93Nbm and 54Mn activities. Procedures have been developed for retrospective dosimetry applicable at normally equipped radiochemical laboratories. Chemical separation procedures have been applied followed by determination of the amount of niobium in dissolution after separation. Special attention has been given to the accurate counting of the very weak X rays of 93Nbm. Different techniques have been applied. Advantages, disadvantages, and the accuracy that can be achieved are discussed. Special attention has been given to the maximum accuracy that can be reached and the minimum amount of niobium that has to be collected to reach this accuracy.

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