Radioluminescence by synchrotron radiation with lower energy than the Cherenkov light threshold in water
Radioluminescence by synchrotron radiation with lower energy than the Cherenkov light threshold in water
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能量低于水中切伦科夫光阈值的同步加速器辐射的放射发光
DOI：
10.1088/2399-6528/ab9f8d
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发表时间：
2020
影响因子：
1.2
通讯作者：
Yamamoto Seiichi
中科院分区：
文献类型：
--
作者：
Hirano Yoshiyuki;Komori Masataka;Onoda Daichi;Nagae Takayuki;Yamamoto Seiichi
在水中，能量低于切伦科夫阈值（10260 keV）的质子和碳离子的辐射发光已被观察到。然而，发光的起源还没有得到很好的研究。在目前的工作中，我们成像的放射性发光在水中使用同步辐射，是足够低的能量（11千电子伏）比切伦科夫阈值，我们测量其光谱使用高灵敏度的冷却CCD相机和光学长通滤波器具有5个不同的阈值。此外，为了确定水中杂质的影响，将水目标从超纯水变更为自来水。还进行了Monte Carlo模拟（Geant 4），以将其结果与实验获得的放射性发光分布进行比较。在模拟中，光子的产生与水中的能量沉积成比例。结果，通过水中的放射性发光清晰地成像了束流轨迹。在假设没有峰的情况下，光谱与λ− 3.4±0.4成比例。在光谱和分布上，超纯水和自来水之间没有观察到差异。测定了超纯水和作为杂质的自来水的TOC（总有机碳）含量，分别为0.26 mg l-1和2.3 mg l-1。放射性发光似乎归因于水分子而非杂质。模拟的放射性发光分布与实验分布一致，这表明放射性发光与剂量成比例，预期可用于剂量测量。
Radioluminescence by protons and carbon ions of energy lower than the Cherenkov threshold (∼ 260 keV) in water has been observed. However, the origin of the luminescence has not been investigated well. In the present work, we imaged radioluminescence in water using synchrotron radiation that was of sufficiently lower energy (11 keV) than the Cherenkov threshold and we measured its spectrum using a high-sensitivity cooled CCD camera and optical longpass filters having 5 different thresholds. In addition, to determine effects of impurities in water, the water target was changed from ultrapure water to tap water. Monte Carlo simulation (Geant4) was also performed to compare its results with the experimentally obtained radioluminescence distribution. In the simulation, photons were generated in proportion to the energy deposition in water. As a result, the beam trajectory was clearly imaged by the radioluminescence in water. The spectrum was proportional to λ− 3.4±0.4 under an assumption of no peaks. In the spectrum and distribution, no differences were observed between ultrapure water and tap water. TOC (total organic carbon) contents of ultrapure water and tap water as an impurity were measured and these were 0.26 mg l− 1 and 2.3 mg l− 1, respectively. The radioluminescence seemed to be attributable to water molecules not impurities. The radioluminescence distribution of the simulation was consistent with the experimental distribution and this suggested that radioluminescence was proportional to dose, which is expected to allow use for dose measurement.
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DOI：
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