Soft X-ray Radiation and Monte Carlo Simulations: Good Tools to Describe the Radiation Chemistry of Sub-keV Electrons.,The Journal of Physical Chemistry A

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Soft X-ray Radiation and Monte Carlo Simulations: Good Tools to Describe the Radiation Chemistry of Sub-keV Electrons.
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2020-03-02 , DOI: 10.1021/acs.jpca.9b10539
Lucie Huart _{1,

2,

3} , Christophe Nicolas ₂ , Josiane A Kaddissy ₃ , Jean-Michel Guigner ₁ , Alain Touati ₁ , Marie-Françoise Politis ₄ , Pascal Mercere ₂ , Benoit Gervais ₅ , Jean-Philippe Renault ₃ , Marie-Anne Hervé du Penhoat ₁

Affiliation

The description of the biological effects of ionizing radiation requires a good knowledge of the dose deposition processes at both the cellular and molecular scales. However, experimental studies on the energy deposition specificity of sub-keV electrons, produced by most radiations, including high-energy photons and heavy ions, are scarce. Soft X-rays (0.2-2 keV) are here used to probe the physical and physico-chemical events occurring upon exposure of liquid water to sub-keV electrons. Liquid water samples were irradiated with a monochromatic photon beam at the SOLEIL synchrotron. Hydroxyl radical quantification was conducted through HO• scavenging using benzoate to form fluorescent hydroxybenzoate. The yields of HO• radicals exhibit a minimum around 1.5 keV, in good agreement with indirect observation. Moreover, they are relatively independent of the benzoate concentration in the range investigated, which corresponds to scavenging times of 170 ns to 170 ps. These results provide evidence that sub-keV electrons behave as high linear energy transfer particles, since they are able to deposit tens to hundreds of electronvolts in nanometric volumes.

中文翻译：

软X射线辐射和蒙特卡洛模拟：描述sub-keV电子辐射化学的良好工具。

对电离辐射的生物学效应的描述需要对细胞和分子水平的剂量沉积过程有充分的了解。但是，关于由大多数辐射（包括高能光子和重离子）产生的亚keV电子的能量沉积特异性的实验研究很少。在这里，软X射线（0.2-2 keV）用于探测在液态水暴露于亚keV电子时发生的物理和物理化学事件。在SOLEIL同步加速器上用单色光子束照射液态水样品。使用苯甲酸酯通过HO•清除进行羟基自由基定量，以形成荧光羟基苯甲酸酯。HO•自由基的收率最低约为1.5 keV，与间接观察结果非常吻合。此外，它们相对独立于所研究范围内的苯甲酸酯浓度，这对应于170 ns至170 ps的清除时间。这些结果提供了证据，表明亚keV电子具有高线性能量转移粒子的性能，因为它们能够在纳米体积中沉积数十至数百个电子伏特。

更新日期：2020-03-03

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