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<p>Multiple sets of toluene-based unquenched standards, procured over the last 3 decades, were analyzed to determine their stability over time. A statistical analysis was performed to provide insight into the variability for tSIE and counting efficiency measurements of <sup>3</sup>H and <sup>14</sup>C isotopes. Our data suggests that standards remain viable even 30&#xa0;years after the manufacturer’s recommended expiration date. Overall, these standards have shown no statistically significant sign of performance degradation. We have proven through statistical analysis that these standards can provide comparable performance over time well past their manufactured expiration date.</p>

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Statistical analysis of the performance and long-term stability of unquenched LSC standards (3H, 14C) used for radiochemical measurements

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月26日

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  • Phuong Pham,
  • Ingrid Lehman-Andino,
  • Valerie Nwadeyi,
  • Nathan Boyle,
  • Kalee Fenker,
  • Cecilia C. DiPrete,
  • David P. DiPrete

摘要

Multiple sets of toluene-based unquenched standards, procured over the last 3 decades, were analyzed to determine their stability over time. A statistical analysis was performed to provide insight into the variability for tSIE and counting efficiency measurements of 3H and 14C isotopes. Our data suggests that standards remain viable even 30 years after the manufacturer’s recommended expiration date. Overall, these standards have shown no statistically significant sign of performance degradation. We have proven through statistical analysis that these standards can provide comparable performance over time well past their manufactured expiration date.