NDLI: Design, production, metrological tests and certification of a large-volume (200L) calibration source for gamma-spectrometry systems for assay of radioactive waste drums

Content Provider	IEEE Xplore Digital Library
Author	Mitev, K. Boshkova, T. Minev, L.
Copyright Year	2010
Description	Author affiliation: Sofia University “St. Kliment Ohridski”, Faculty of Physics, Department of Atomic Physics, Sofia 1164, Bulgaria (Mitev, K.; Boshkova, T.) \|\| Three Sigma Ltd (Minev, L.)
Abstract	This work describes a concept for and a realization of a large-volume (200 L) certified source (calibration drum) for calibration of gamma-spectrometry systems used for Assay of Radioactive Waste Drums. The design of the calibration drum is based on the idea of modeling a homogenous source by a large number of point sources. We deal with the problem of finding an optimal number of point sources and their appropriate arrangement to obtain close modeling of a homogenous source. An original model for the arrangement of the sources is derived and presented. We demonstrate quantitatively that with the proposed arrangement of 448 point sources a very close modeling of a homogenous drum is achieved. A wooden matrix was constructed from 14 discs stuck together, in which 32 axial holes were drilled, following the abovementioned design. 470 standard sources — Certified Reference Materials — Modules (CRM-Modules) were produced by transferring equal masses of standardized $^{152}Eu$ solution in each of them. The activity of each CRM-Module is 68,6 ± 1,4 kBq. The CRM-Modules are made from polycarbonate with cylindrical shape (Φ 25 × 56 mm). All modules were subjected to a large number of tests for validation of their individual metrological characteristics. The results from these tests allowed all CRM-Modules to be certified by the Bulgarian National Metrological Institute. 32 tubes, each containing 14 Certified Reference Materials — Modules (CRM-Modules) are placed in the holes. The calibration drum contains 448 CRM-Modules with overall activity 30,72 ± 0,65 MBq. After the final assembly, the calibration drum was subjected to a number of tests, which proved its metrological characteristics. As a result, the Large-volume source was also certified by the Bulgarian National Metrological Institute and it is in use for calibration of a system for assay of drummed radioactive waste.
Starting Page	464
Ending Page	471
File Size	3059350
Page Count	8
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5873804
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Calibration Electron tubes Detectors Numerical models Monte Carlo methods Physics Materials
Content Type	Text
Resource Type	Article

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