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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Experimental Determination of the Dependence of OH Radical Yield on Photon Energy: A Comparison with Theoretical Simulations
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Experimental Determination of the Dependence of OH Radical Yield on Photon Energy: A Comparison with Theoretical Simulations

机译：OH自由基产率对光子能量依赖性的实验确定：与理论模拟的比较

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On the basis of simulations of water radiolysis, it has been postulated that the yield of OH radicals, which become homogeneously distributed, is dependent upon energy when irradiated with low-energy photons. The aim of this study is to determine experimentally the dependence of the yield of OH radicals, which escape intratrack recombination, on photon energy of incident radiation using plasmid DNA as a probe. The yields of single strand breaks (ssb) induced in plasmid DNA (pUC18) when irradiated with photons varying in energy from 0.28 keV to 1.25 MeV was determined and, when normalized relative to the yield for ~(60)Co irradiation, may be used as a measure of the yield of OH radicals escaping radiation tracks. As the photon energy decreases from 1.25 MeV to 1.5 keV the OH radical yield decreases from 0.290 to 0.072 #mu#mol J~(-1), respectively, in line with an increased ionization density of the radiation and hence an increasing probability of radical recombination. However, with a further decrease in photon energy from 1.5 to 0.28 keV there is an upturn in OH radical yields. Carbon-K X-rays are found to have a significantly higher yield of 0.257 #mu#mol J~(-1) than that associated with the higher energies. The experimental dependence is compared with a number of theoretical calculations, which predict an upturn in OH radical yields between 0.1 and 1 keV. Such a dependence of OH radical yields on energy provides experimental data suitable for direct comparison with simulations, aiding their refinement and development.
机译：根据水辐射分解的模拟，已假定当被低能光子照射时，变得均匀分布的OH自由基的产率取决于能量。这项研究的目的是使用质粒DNA作为探针，通过实验确定逃逸轨道内重组的OH自由基的产率对入射辐射的光子能量的依赖性。当用能量在0.28 keV至1.25 MeV之间变化的光子辐照时，确定了质粒DNA（pUC18）中诱导的单链断裂（ssb）的产量，并且可以将其相对于〜（60）Co辐照的产量进行归一化处理作为逃避辐射径的OH自由基收率的度量。随着光子能量从1.25 MeV降至1.5 keV，OH自由基的收率分别从0.290降低至0.072＃mu＃mol J〜（-1），这与辐射的电离密度增加以及自由基的可能性增加相一致。重组。但是，随着光子能量从1.5 keV进一步降低到0.28 keV，OH自由基的收率也随之增加。发现碳-K X射线的产率比与较高能量相关的产率高得多，为0.257＃mu＃mol J〜（-1）。将实验依赖性与许多理论计算进行了比较，这些理论计算预测了OH自由基收率在0.1 keV与1 keV之间上升。 OH自由基产率对能量的这种依赖性提供了适合与模拟直接比较的实验数据，有助于其改进和发展。

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