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Related Experiment Video

Updated: Aug 12, 2025

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Thorium and uranium trace ICP-MS analysis for AMoRE project.

Olga Gileva1, JunSeok Choe1, Yeongduk Kim2

  • 1Center for Underground Physics, Institute for Basic Science (IBS), Daejeon, 34126, South Korea.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|January 26, 2023
PubMed
Summary

The AMoRE experiment rigorously tested materials for neutrinoless double-beta decay searches. Inductively coupled plasma mass spectrometry (ICP-MS) assays ensured ultra-low radioactive contamination in critical detector components, crucial for background reduction.

Keywords:
AMoRE projectICP-MSSPEThoriumTrace analysisUTEVAUranium

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Area of Science:

  • Nuclear physics
  • Particle physics
  • Experimental physics

Background:

  • The AMoRE experiment searches for neutrinoless double-beta decay of Molybdenum-100 using cryogenic detectors.
  • Ultra-low radioactive contamination in detector components is essential to minimize background noise.

Purpose of the Study:

  • To summarize the ICP-MS assay program for AMoRE, focusing on radio purity of detector materials.
  • To establish sensitive analytical methods for trace radioactive isotopes in Molybdenum-100 compounds, copper, and light reflectors.

Main Methods:

  • Inductively coupled plasma mass spectrometry (ICP-MS) was employed for trace analysis of Thorium (Th) and Uranium (U).
  • Sample preparation involved UTEVA® resin for Molybdenum-100 powder and solid-phase extraction for copper components.
  • Microwave ashing was used for the full decomposition of Vikuiti™ ESR films.

Main Results:

  • Detection limits for Th and U in Molybdenum-100 powder were 2.3 ppt and 1.0 ppt, respectively, with >90% recovery yield.
  • Detection limits for Th and U in high-purity copper were as low as 0.1 ppt and 0.2 ppt.
  • Procedural detection limits for Th and U in Vikuiti™ ESR films were approximately 1 ppt.

Conclusions:

  • The developed ICP-MS methods and sample preparation techniques successfully achieved ultra-low detection limits for critical radioisotopes.
  • The radio purity assays confirmed the suitability of the selected materials for the AMoRE detector construction.
  • This rigorous material assay program is vital for the success of rare event searches like neutrinoless double-beta decay.