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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Radiation induced radical in barium sulphate for ESR dosimetry: a preliminary study
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Radiation induced radical in barium sulphate for ESR dosimetry: a preliminary study

机译：硫酸钡中辐射诱发的自由基用于ESR剂量测定的初步研究

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摘要

Barium sulphate (BaSO_4) was irradiated by γ-rays and analyzed with electron spin resonance (ESR) to study radiation induced radicals for materials as radiation dosimeter. The ESR spectrum for the radical species is characterized by a hole-type center with g factor of 2.019, 2.0127 and 2.0103 and electron-type center with g factor of 2.0039, 2.0025 and 2.0001. The dosimetric signal with splitting factors of g = 2.0039 is ascribed to SO_3~- radicals and 5G linewidth. The response to γ-ray dose ranging from 5 to 10~3 Gy, energy dependence calculation and the thermal stability have been studied. The number of free radicals per 100 eV (G-value) was obtained to be 0.25 +- 0.06 and 0.9 +- 0.18 for BaSO_4 and alanine, respectively. The lifetime of radicals and the activation energy were estimated from Arrhenius plots to be approximately 325 +- 60 days, and 0.50 +- 0.09 eV respectively.
机译：用γ射线辐照硫酸钡（BaSO_4），并用电子自旋共振（ESR）进行分析，以研究辐射诱导的自由基作为材料的辐射剂量计。自由基物种的ESR光谱的特征在于，空穴型中心的g因子为2.019、2.0127和2.0103，电子类型中心的g因子为2.0039、2.0025和2.0001。分裂因子为g = 2.0039的剂量信号归因于SO_3-自由基和5G线宽。研究了γ射线剂量在5〜10〜3 Gy范围内的响应，能量依赖性计算和热稳定性。对于BaSO 4和丙氨酸，每100eV的自由基数目（G值）分别为0.25±0.06和0.9±0.18。根据阿伦尼乌斯曲线估计，自由基的寿命和活化能分别约为325±60天和0.50±0.09 eV。

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