液氮温度下甲酸铀酰红外激光光化学研究
STUDIES OF IR LASER CHEMISTRY OF URANYL FORMATE IN LIQUID NITROGEN
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摘要: 采用红外10.6μmTEA—CQ_2选频激光,辐照液氮介质中的UO_2(HCOO)_2·H_2O晶体,研究了光解产物的产额与激光通量、频率及辐照时间的关系,明确了共振吸收的光化学反应与非共振吸收的热反应之间的差异。鉴定与分析了光照产物的组成结构,证明10 P(34)-10 P(38)支,在能量1J/脉冲、重复频率1 Hz的条件下,光化产物组成为UO_2和 U_3O_8的混合物。对光化产物进行化学分离,经离子交换分离出U(IV)和U(VI)。对U(VI)未发现~(235)U浓集效应。11个U(IV)样品测得~(235)U同位素浓集因子ε=0.004～0.017,均值为0.0089±0.004。Abstract: Crystal uranyl formate is irradiated in liquid nitrogen with the selectedfrequency laser beam of infra-red 10.6μm TEA CO_2 laser. The effects of laserflux, frequency and irradiation time on the yield is studied. The difference inkinetics between the light reaction induced by the resonant absorption and thethermoreaction induced by the nonresonant absorption are made clearly. Byanalysing products of photoreaction, the composition of them is measured as UO_2and U_3O_8 with the ratio about 1:4. After dissolving U_3O_8 in HCl, U(Ⅳ) andU(Ⅵ) can be separated with ion-exchange process. Isotope enrichment of ~(235)U inU(Ⅳ)in eleven separated samples is determined, the isotope enrich factor (ε) isabout 0.0089±0.004, with the range from 0.004 to 0.017.
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Keywords:
- Uranyl formate ,
- laser chemistry
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[1] Muller, C. H. et al., Photochemical uranium enrichment in solids, Final report GA-C17227 (1984). [2] Porter, J. T., US patent 4200507 (1980). [3] 姚康年等,核化学与放射化学,10(4), 238(1988). [4] Zhirov, A. V. et al., Zh. Neorg. Khim., 23 (11), 3072 (1978). [5] Buttress, G. D. et al., J Chem. Soc. A 1272 (1968). [6] Bressat. R. et al., Solid state photoreduction of uranyl formate monohydrate, 6th Int Conf no Photochemistry, Bordeaux(1971).
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