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<p>A direct method for measuring <sup>14</sup>C in water samples by liquid scintillation counting has been validated according to ISO/IEC 17025 requirements using TriCarb 2900TR and Quantulus 1220 liquid scintillation counters. Optimal parameters included 20&#xa0;mL polyethylene vials, 8:12 ratio sample to cocktail ratio, and Ultima Gold LLT scintillation cocktail. Counting windows were set to avoid <sup>3</sup>H interference. Validation was performed considering precision, accuracy, uncertainty, decision threshold, and detection limit. Results were confirmed through internal quality control and interlaboratory comparisons. The measured <sup>14</sup>C activity in drinking water and Ebro River samples was below the detection limit, confirming that nuclear power plant discharges remained within authorized limits.</p>

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Validation of a direct method for measuring 14C in water by liquid scintillation counting (according to the ISO/IEC 17025 criteria)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月11日

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  • Joana Martínez,
  • Abril Trullàs,
  • Magdiel Gongora,
  • Alejandra Peñalver,
  • Francesc Borrull,
  • Carme Aguilar

摘要

A direct method for measuring 14C in water samples by liquid scintillation counting has been validated according to ISO/IEC 17025 requirements using TriCarb 2900TR and Quantulus 1220 liquid scintillation counters. Optimal parameters included 20 mL polyethylene vials, 8:12 ratio sample to cocktail ratio, and Ultima Gold LLT scintillation cocktail. Counting windows were set to avoid 3H interference. Validation was performed considering precision, accuracy, uncertainty, decision threshold, and detection limit. Results were confirmed through internal quality control and interlaboratory comparisons. The measured 14C activity in drinking water and Ebro River samples was below the detection limit, confirming that nuclear power plant discharges remained within authorized limits.