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Related Experiment Videos

Uranium beam characterization at CIRCE for background and contamination determinations.

M De Cesare1, N De Cesare2, A D'Onofrio2

  • 1Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, ACT 0200, Canberra, Australia; CIRCE and Dipartimento di Matematica e Fisica, Seconda Università di Napoli, via Vivaldi 43, 81100 Caserta, Italy.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|June 24, 2015
PubMed
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Accelerator Mass Spectrometry (AMS) offers superior sensitivity for actinide measurements in environmental samples. This study details an upgraded AMS system at CIRCE, achieving ultra-trace detection of radioactive nuclides.

Area of Science:

  • Nuclear Physics
  • Environmental Science
  • Analytical Chemistry

Background:

  • Radioactive nuclides like actinides are present in the environment at ultra-trace levels due to past nuclear weapons tests, nuclear waste disposal, and nuclear power plant operations.
  • Accelerator Mass Spectrometry (AMS) is the most sensitive technique for measuring these actinides, surpassing Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Thermal Ionization Mass Spectrometry (TI-MS).

Purpose of the Study:

  • To detail the development and routine operation of an upgraded actinide AMS system at the Center for Isotopic Research on Cultural and Environmental heritage (CIRCE).
  • To optimize measurement conditions for actinides using a 3-MV pelletron tandem accelerator.

Main Methods:

  • Characterization of an upgraded actinide AMS system at CIRCE, utilizing a 3-MV pelletron tandem accelerator.
Keywords:
AMSInterferences ionsTOF-E systemsUranium

Related Experiment Videos

  • Measurement of charge state distribution, beam emittance, and energy/position validation of Uranium ions.
  • Determination of background levels and interferences for actinide isotopic ratio measurements.

    • Main Results:

    • The upgraded AMS system at CIRCE was routinely operated for actinide measurements.
    • Optimized measurement conditions were determined through various beam characteristic validations.
    • A (236)U/(238)U isotopic ratio background level of approximately 5×10(-12) to 3×10(-13) was achieved, depending on Time of Flight-Energy (TOF-E) configurations.
    • Spatial distribution of interfering ions and a (236)U contamination mass of ~0.5 fg were quantified.

    Conclusions:

    • The upgraded actinide AMS system at CIRCE is capable of highly sensitive measurements of actinides in environmental samples.
    • The system's performance was validated, establishing low background levels and quantifying interferences.
    • This advancement enables more accurate assessment of environmental radioactivity from anthropogenic sources.