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Title: A novel assay method for the trace determination of Th and U in copper and lead using inductively coupled plasma mass spectrometry

This study describes a novel sample preparation and assay method developed in support of the MAJORANA DEMONSTRATOR experiment for the determination of thorium and uranium levels in copper and lead shielding components. Meticulously clean sample preparation methods combined with novel anion exchange separations for analyte pre-concentration and matrix removal were developed. Quantification was performed by inductively coupled plasma mass spectrometry. Detection limits of 0.0084 pg 232Th/g and 0.0106 pg 238U/g were determined for copper, while detection limits of 0.23 pg 232Th/g and 0.46 pg 238U/g were achieved for lead. These methods allow the Majorana Collaboration to accurately assay detector components and ensure that the experiment’s stringent radiopurity requirements are met.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
1171869
Report Number(s):
PNNL-SA--104924
Journal ID: ISSN 0168-9002; 830403000; TRN: US1500036
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; Journal Volume: 775
Publisher:
Elsevier
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ICP MASS SPECTROSCOPY; COPPER; LEAD; THORIUM 232; URANIUM 238; CONCENTRATION RATIO; Trace Amounts; SAMPLE PREPARATION; SENSITIVITY; ION EXCHANGE; REMOVAL; SHIELDING; Radiation Detectors; Impurities Ultratrace, Uranium, Thorium, Radiopurity Assay, ICP-MS, Majorana