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测定氟苯、邻氟甲苯、对氟甲苯及三氟甲苯经F~(19)(γ,n)F~(18)核反应后的化学状态,有机保留百分值分别为39,33,39和47;在照射前加入0.2克分子分数苯胺后,保留值分别降到20,24,20和27。固体对氟苯甲酸的保留为15,3M对氟苯甲酸呲啶溶液为零。测定氟、氯、溴和碘四种卤代苯经(γ,n)核反应产生的氟-18、氯-34、溴-78和碘-126的化学状态,保留值分别为39,74,51和>51,母体保留值分别为19,41,36和>41。并用弹性碰撞理论解释有机氟化物的母体保留占总保留的百分比小于氯、溴和碘的相应化合物的原因。用氟苯及其乙醇溶液、对氟甲苯和对氟苯甲酸等化合物体系,比较F~(19)(γ,n)F~(18)和F~(19)(n,2n)F~(18)核反应的化学效应。结果说明“热”原子的过剩能量对最终的化学状态无显著的贡献。测定氯、溴、碘三种卤代苯的(n,γ)核反应产生的氯-38、溴-80、碘-128的保留值,并与(γ,n)反应产物作相应的对比,结果同样说明无显著的能量效应。测定氟硼酸钠及其水溶液的(γ,n)产物氟-18的化学状态,保留分别为88和0。用芳基氟和氟硼酸钠可制备高比度的无机氟-18离子。浓集系数的数量级分别为10~3和10~2。
The chemical states of fluorobenzene, o-fluorotoluene, p-fluorotoluene and benzotrifluoride after F ~ (19) (γ, n) F ~ (18) nuclear reaction were determined. The organic retention percentages were 39, 33, 39 and 47; retention values were reduced to 20, 24, 20 and 27, respectively, after the addition of aniline 0.2 mol fraction prior to irradiation. The solid p-fluorobenzoic acid was retained at 15,3 M p-fluorobenzoic acid pyridine solution was zero. The chemical states of fluorine-18, chlorine-34, bromine-78 and iodine-126 produced by the (γ, n) nuclear reactions of fluorine, chlorine, bromine and iodine were determined. The retention values were 39,74,51 And> 51, the parent retention values are 19, 41, 36 and> 41, respectively. The elastic collision theory is used to explain the reason why the parent organofluoride retains less than the total retained percentage of the corresponding compounds of chlorine, bromine and iodine. (19) (γ, n) F ~ (18) and F ~ (19) (n, 2n) F ~ (19) were obtained by using fluorobenzene and its alcohol solution, 18) Chemical effects of nuclear reactions. The result shows that the excess energy of the “hot” atom has no significant contribution to the final chemical state. Determination of chlorine, bromine, iodine three kinds of halogenated benzene (n, γ) nuclear chlorine -38, bromine -80, iodine -128 retention value, and with the (γ, n) reaction products for the corresponding comparison, the results The same shows no significant energy effect. The chemical states of fluorine-18, the (γ, n) product of sodium fluoborate and its aqueous solution, were determined, leaving 88 and 0, respectively. With aryl fluoride and sodium fluoborate can be prepared by a high degree of inorganic fluorine -18 ion. The order of concentration coefficient is 10 ~ 3 and 10 ~ 2, respectively.