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NIST Ionization Chamber "A" Sample-Height Corrections.

Ryan Fitzgerald1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

Journal of Research of the National Institute of Standards and Technology
|February 23, 2016
PubMed
Summary
This summary is machine-generated.

A positioning ring slippage in NIST

Keywords:
Half-lifeionization chamber

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Area of Science:

  • Nuclear physics
  • Metrology

Background:

  • NIST's pressurized ionization chamber "A" (PIC "A") has been used for radioactivity measurements for over 30 years.
  • Evidence suggests historical measurements may be inaccurate due to undetected source positioning ring slippage.

Purpose of the Study:

  • To investigate the impact of source positioning ring slippage on radioactivity measurements.
  • To develop a quantitative model to correct historical data affected by this error.

Main Methods:

  • Historical data analysis and new sensitivity tests were conducted.
  • A quantitative model was developed to assess the temporal change in detector response.
  • Corrections were estimated for past measurement results from PIC "A".

Main Results:

  • Source positioning ring slippage caused temporal changes in source height, leading to detector response drift.
  • This resulted in relative errors in measured activity ranging from 10⁻⁵ to 10⁻³ per year.
  • Calibration factors and half-life determinations were affected by the drifting detector response.

Conclusions:

  • The developed model quantifies the impact of slippage on past measurements.
  • Corrections have been estimated for affected historical data.
  • The positioning ring has been repaired, and recalibration is underway with enhanced quality control.