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The impact of polyethylene vials on reactor channel characterization in k 0 -NAA

The impact of polyethylene vials on reactor channel characterization in k 0 -NAA Reactor channel characterization is commonly performed by irradiating bare and cadmium-covered “fluence rate monitors”, avoiding as much as possible the use of irradiation vials and spacers to position the monitors inside the channel. However, in routine k 0 -Neutron Activation Analysis often samples are packed in small polyethylene vials prior to irradiation. This work aims at studying the impact of typical NAA polyethylene vials (~1 mm wall thickness) on the determination of the f and α channel-specific parameters through the “Bare”, “Cadmium-Covered” and “Cadmium-Ratio” methods. The impact of these vials on each method was studied for 3 irradiation channels of the Belgian Reactor 1 at SCK · CEN (Mol, Belgium) with low to high f and α -values. The net impact was 1% on each parameter. Inconsistencies between the different methods were found when the impact of the polyethylene was neglected, implying that all determination methods must be pooled and thin monitors should be used for an accurate channel characterization. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Radioanalytical and Nuclear Chemistry Springer Journals

The impact of polyethylene vials on reactor channel characterization in k 0 -NAA

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References (12)

Publisher
Springer Journals
Copyright
Copyright © 2010 by Akadémiai Kiadó, Budapest, Hungary
Subject
Chemistry; Inorganic Chemistry ; Diagnostic Radiology; Nuclear Physics, Heavy Ions, Hadrons; Physical Chemistry ; Nuclear Chemistry
ISSN
0236-5731
eISSN
1588-2780
DOI
10.1007/s10967-010-0783-2
Publisher site
See Article on Publisher Site

Abstract

Reactor channel characterization is commonly performed by irradiating bare and cadmium-covered “fluence rate monitors”, avoiding as much as possible the use of irradiation vials and spacers to position the monitors inside the channel. However, in routine k 0 -Neutron Activation Analysis often samples are packed in small polyethylene vials prior to irradiation. This work aims at studying the impact of typical NAA polyethylene vials (~1 mm wall thickness) on the determination of the f and α channel-specific parameters through the “Bare”, “Cadmium-Covered” and “Cadmium-Ratio” methods. The impact of these vials on each method was studied for 3 irradiation channels of the Belgian Reactor 1 at SCK · CEN (Mol, Belgium) with low to high f and α -values. The net impact was 1% on each parameter. Inconsistencies between the different methods were found when the impact of the polyethylene was neglected, implying that all determination methods must be pooled and thin monitors should be used for an accurate channel characterization.

Journal

Journal of Radioanalytical and Nuclear ChemistrySpringer Journals

Published: Nov 1, 2010

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