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63Ni activity measurements a bilateral intercomparison.

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Summary

This study compared Nickel-63 (⁶³Ni) standardization between BARC, India, and NMIJ, Japan. Results show excellent agreement, confirming the accuracy of radioactivity measurement techniques.

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Area of Science:

  • Nuclear Metrology
  • Radioactivity Standardization
  • Applied Nuclear Physics

Background:

  • Accurate standardization of beta emitters like Nickel-63 (⁶³Ni) is crucial for international traceability.
  • BARC, India, and NMIJ, Japan, collaborated to assess their capabilities before broader trial exercises.
  • The study aimed to implement and test methods for extending the Standard Ionization Chamber (SIR) to beta emitters.

Purpose of the Study:

  • To assess the accuracy and capabilities of BARC for ⁶³Ni standardization.
  • To compare radioactivity measurement results obtained by BARC and NMIJ.
  • To evaluate the performance of different standardization techniques.

Main Methods:

  • Bilateral intercomparison between BARC (India) and NMIJ (Japan).
  • BARC utilized the CIEMAT/NIST efficiency tracing technique using a tritium (³H) standard.
  • NMIJ employed the Triple to Double Coincidence Ratio (TDCR) method.

Main Results:

  • A low percentage deviation of 0.27% in ⁶³Ni activity concentration was observed between BARC and NMIJ.
  • The calculated E<0xE2><0x82><0x99> score of -0.12 (with k=2) indicates excellent agreement.
  • Degrees of equivalence were calculated as -0.06 kBq g⁻¹, confirming comparability within uncertainty limits.

Conclusions:

  • The activity concentration of ⁶³Ni measured by BARC and NMIJ are in excellent agreement.
  • The results demonstrate the comparability and accuracy of the radioactivity standards maintained by both laboratories.
  • The findings validate the methods used for ⁶³Ni standardization and support the extension of SIR to beta emitters.