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Related Experiment Videos

Standardisation of 231Pa by defined solid angle and liquid scintillation methods at NPL.

A Arinc1, J D Keightley1

  • 1National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|May 1, 2020
PubMed
Summary

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Precise Protactinium-231 (Pa-231) standards are crucial for nuclear dating. NPL

Area of Science:

  • Nuclear Physics and Metrology
  • Radiochemistry and Isotope Science

Background:

  • Protactinium-231 (Pa-231) is the longest-lived decay product in the Uranium-235 (U-235) decay chain.
  • Accurate and traceable measurements of Pa-231 are essential for applications like geochronometry and nuclear forensics.
  • International comparisons are vital for validating measurement standards.

Purpose of the Study:

  • To determine the activity per unit mass of a Pa-231 solution.
  • To participate in the international measurement comparison CCRI(II)-K2.Pa-231.
  • To validate measurement techniques for Pa-231 standardization.

Main Methods:

  • Three independent techniques were employed at the National Physical Laboratory (NPL).
  • Defined solid angle alpha counting, utilizing a new instrument for BIPM comparison.
Keywords:
4π liquid scintillation-γ coincidence counting4πα liquid scintillationDSA α countingPa-231 standardisation

Related Experiment Videos

  • 4π alpha liquid scintillation (LS) counting with the CIEMAT/NIST method.
  • 4π(LS) alpha-gamma coincidence counting using a custom NPL system with HPGe spectrometry.

    • Main Results:

    • Excellent agreement was achieved between the three independent measurement methods.
    • The results contribute to the international CCRI(II)-K2.Pa-231 comparison.
    • The study validates the reliability of the employed techniques for Pa-231 activity determination.

    Conclusions:

    • The study successfully established a precise activity per unit mass for Pa-231.
    • The agreement between methods provides confidence in the traceability of Pa-231 measurements.
    • These findings support accurate applications in nuclear dating and forensics.