Taguchi Mitsumasa, Kojima Takuji
Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute, Takasaki, Gunma, Japan.
Radiat Res. 2005 Apr;163(4):455-61. doi: 10.1667/rr3330.
The purpose of the present study was to evaluate the dependence of the OH radical yield on the atomic number and the energy of the heavy ions to understand chemical reactions of aqueous solutions. The total yields of oxidized products from phenol in water increased superlinearly as the incident energy increased from 5 MeV/nucleon to 18 MeV/nucleon for carbon and neon ions. The radiolytic yields of OH radicals produced by the ions were determined by analyzing the relationships of the oxidation yields of phenol to the incident energies up to 18 MeV/nucleon for ions in the range of LET from 110 eV/nm to 550 eV/nm and from 320 eV/nm to 1100 eV/nm for carbon and neon ions, respectively. The yields of the OH radicals increased with the specific energy for the same kind of ion and decreased with the atomic number for different ions used at the same specific energy.
本研究的目的是评估羟基自由基产率对重离子原子序数和能量的依赖性，以了解水溶液中的化学反应。对于碳离子和氖离子，当入射能量从5兆电子伏/核子增加到18兆电子伏/核子时，水中苯酚氧化产物的总产率超线性增加。通过分析苯酚氧化产率与入射能量的关系，分别确定了在110电子伏/纳米至550电子伏/纳米的传能线密度范围内的碳离子以及320电子伏/纳米至1100电子伏/纳米范围内的氖离子，在高达18兆电子伏/核子的入射能量下产生的羟基自由基的辐射产率。对于同一种离子，羟基自由基的产率随比能增加而增加；对于相同比能下使用的不同离子，羟基自由基的产率随原子序数增加而降低。
