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.
Revised: February 26, 2015 |
Published: March 1, 2015
Citation
LaFerriere B.D., T.C. Maiti, I.J. Arnquist, and E.W. Hoppe. 2015.A Novel Assay Method for the Trace Determination of Th and U in Copper and Lead Using Inductively Coupled Plasma Mass Spectrometry.Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment 775.PNNL-SA-104924.doi:10.1016/j.nima.2014.11.052