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<p>This study validates para-arsanilic acid as a high-performance Electron Paramagnetic Resonance-based dosimeter for radiation processing. Gamma-irradiated rods exhibited complex resonance signatures with g-factors of 2.0041, 2.2453 and 2.5303, identifying multiple stable free-radical centers. The system demonstrates a sensitive dose-response from 0.2 to 6&#xa0;kGy, featuring a highly linear calibration curve within the 0.5–5&#xa0;kGy range. Key performance indicators include excellent post-irradiation stability over 50&#xa0;days and significant resistance to humidity variations up to 60% RH. With a low expanded uncertainty (2σ) of 6.73%, these rods provide a dependable, sturdy, and accurate option for dose monitoring of industrial and research quality.</p>

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Investigation of radiation-induced free radicals in p-arsanilic acid rods using electron spin resonance for γ-ray dosimetric applications

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • El-Saeid Ramadan El-Shawadfy,
  • Sameh Mohammed Gafar

摘要

This study validates para-arsanilic acid as a high-performance Electron Paramagnetic Resonance-based dosimeter for radiation processing. Gamma-irradiated rods exhibited complex resonance signatures with g-factors of 2.0041, 2.2453 and 2.5303, identifying multiple stable free-radical centers. The system demonstrates a sensitive dose-response from 0.2 to 6 kGy, featuring a highly linear calibration curve within the 0.5–5 kGy range. Key performance indicators include excellent post-irradiation stability over 50 days and significant resistance to humidity variations up to 60% RH. With a low expanded uncertainty (2σ) of 6.73%, these rods provide a dependable, sturdy, and accurate option for dose monitoring of industrial and research quality.