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Evaluation of 233Pa decay data.

Huang Xiaolong1, Liu Ping, Wang Baosong

  • 1China Institute of Atomic Energy, China Nuclear Data Center, P.O. Box 275(41), Beijing 102413, China. huangxl@iris.ciae.ac.cn

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|March 15, 2005
PubMed
Summary

This study presents an updated evaluation of Protactinium-233 ((233)Pa) decay data. The precise half-life was determined to be 26.971 days, with a recommended gamma-ray emission probability of 38.35% for the 312-keV line.

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Area of Science:

  • Nuclear Physics
  • Radiochemistry
  • Atomic and Molecular Physics

Background:

  • Accurate decay data for radionuclides like Protactinium-233 ((233)Pa) are crucial for various applications, including nuclear medicine and reactor physics.
  • Previous evaluations of (233)Pa decay characteristics have shown discrepancies, necessitating a comprehensive reassessment.

Purpose of the Study:

  • To perform a thorough evaluation of all available experimental data for (233)Pa decay.
  • To establish a precise half-life and recommended gamma-ray emission probabilities.
  • To construct an updated and complete decay scheme for (233)Pa.

Main Methods:

  • Analysis of published half-life data using various evaluation procedures.
  • Examination of all previously published gamma-ray emission probabilities.

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  • Calculation of internal conversion coefficients and decay intensity balance.
  • Utilizing the ENSDF (Evaluated Nuclear Structure Data File) analysis program for decay characteristics.

    • Main Results:

    • The half-life of (233)Pa was determined with high precision to be 26.971 ± 0.013 days.
    • A recommended gamma-ray emission probability of 38.35 ± 0.28% for the 312-keV gamma line was established.
    • A complete decay intensity balance was obtained using calculated internal conversion coefficients.
    • A new decay scheme for (233)Pa was constructed.

    Conclusions:

    • The updated decay data and scheme for (233)Pa provide a more reliable foundation for nuclear science applications.
    • The precise determination of the half-life and key gamma-ray emission probabilities improves the accuracy of nuclear measurements and models.
    • The comprehensive evaluation contributes to the refinement of nuclear structure and decay information.