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

doi:10.1520/JAI101142

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 journal › Article › Scientific › peer-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 language	English
Article number	Paper ID JAI101142
Journal	Journal of ASTM International
Volume	4
Issue number	4
DOIs	https://doi.org/10.1520/JAI101142
Publication status	Published - 2007
MoE publication type	A1 Journal article-refereed

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

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.",

author = "Voorbraak, {W. P.} and Tommi Kekki and Tom Ser{\'e}n and {Van Bockxstaele}, M. and J. Wagemans and Woittiez, {J. R. W.}",

year = "2007",

doi = "10.1520/JAI101142",

language = "English",

volume = "4",

journal = "Journal of ASTM International",

issn = "1546-962X",

publisher = "American Society for Testing and Materials (ASTM)",

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T1 - Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn

AU - Voorbraak, W. P.

AU - Kekki, Tommi

AU - Serén, Tom

AU - Van Bockxstaele, M.

AU - Wagemans, J.

AU - Woittiez, J. R. W.

PY - 2007

Y1 - 2007

N2 - 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.

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.

U2 - 10.1520/JAI101142

DO - 10.1520/JAI101142

M3 - Article

SN - 1546-962X

VL - 4

JO - Journal of ASTM International

JF - Journal of ASTM International

IS - 4

M1 - Paper ID JAI101142

ER -

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

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