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63Ni, its half-life and standardization: revisited
R Collé1, B E Zimmerman, P Cassette
1Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8462, USA. rcolle@nist.gov
Summary
Accurate nickel-63 half-life measurements confirm NIST and LNHB findings. This research provides a reliable nickel-63 half-life value, crucial for radioactivity standardization and metrology.
Area of Science:
- Nuclear physics
- Radiochemistry
- Metrology
Background:
- Nickel-63 ((63)Ni) is a key radionuclide for radioactivity standardization.
- Long-term monitoring of (63)Ni standards is essential for ensuring measurement consistency.
- Discrepancies in reported (63)Ni half-life values necessitate precise redetermination.
Purpose of the Study:
- To determine an accurate half-life for nickel-63 ((63)Ni).
- To assess the consistency of (63)Ni standards disseminated by NIST over nearly 40 years.
- To compare primary standardization methods for (63)Ni, including liquid scintillation (LS) techniques.
Main Methods:
- Liquid scintillation (LS) measurements were performed at NIST and LNHB.
- The triple-to-double coincidence ratio (TDCR) method was employed for primary standardization.
- CIEMAT/NIST (3)H-standard efficiency tracing (CNET) was used for comparison.
Main Results:
- A (63)Ni half-life of 101.2 ± 1.5 years was determined, aligning with previous findings and offering a more satisfactory value than recent evaluations.
- NIST (63)Ni standards over 38 years show internal consistency.
- Excellent agreement was observed between NIST and LNHB primary standardization results.
Conclusions:
- The determined (63)Ni half-life provides a reliable value for metrological applications.
- NIST's long-term dissemination of (63)Ni standards is validated.
- Inter-laboratory comparison confirms the reliability of primary standardization methods for (63)Ni.
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