Metrological tests of a 200 L calibration source for HPGE detector systems for assay of radioactive waste drums. (March 2016)

• Record Type: Journal Article
• Authors: Boshkova, T.; Mitev, K.
• Is Part Of: Applied radiation and isotopes. Volume 109(2016:Mar.)
• Page Start: 114
• Page End: 117
• Publication Date: 2016-03
• Subjects: Certified reference material (CRM) -- Large volume source -- Test procedures -- Radioactive waste; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2015.11.039
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: In this work we present test procedures, approval criteria and results from two metrological inspections of a certified large volume 152 Eu source (drum about 200 L) intended for calibration of HPGe gamma assay systems used for activity measurement of radioactive waste drums. The aim of the inspections was to prove the stability of the calibration source during its working life. The large volume source was designed and produced in 2007. It consists of 448 identical sealed radioactive sources (modules) apportioned in 32 transparent plastic tubes which were placed in a wooden matrix which filled the drum. During the inspections the modules were subjected to tests for verification of their certified characteristics. The results show a perfect compliance with the NIST basic guidelines for the properties of a radioactive certified reference material (CRM) and demonstrate the stability of the large volume CRM-drum after 7 years of operation. Highlights: Large (200 L) volume drum source designed, produced and certified as CRM in 2007. Source contains 448 identical sealed radioactive 152 Eu sources (modules). Two metrological inspections in 2011 and 2014. No statistically significant changes of the certified characteristics over time. Stable calibration source for HPGe-gamma radioactive waste assay systems.