摘要
本文将光导纤维制成光极和激光诱导荧光技术相结合,成功地用于超微量铀的遥控测定。研究了光极结构对铀荧光测量的影响。发现光极中激发光纤和收集光纤的夹角为25°,测量时样品厚度大于40mm时对铀的荧光探测效率最高,信噪比最佳。在1mol/l磷酸体系中测得铀的检出极限为0.4ppb,精度优于±10％。本方法可方便地用于微量铀的在线或远距离分析。
A method for the remote determination of ultra-low level uranium using laser-induced optical fiber fluorimetry is reported. The structure of the optrode which effects the fluorescence measurement of uranium is studied. Results show that higher detection efficiency and ratio of signal to noise can be obtained when the angle between the incident and exit optical fibers of the optrode is 25 degrees and the thickness of the sample determined is over 40 mm. The detection limit of uranium in 1mol/1 H3PO4 is 0.4 ppb and the precision is better than±10%.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1989年第2期113-117,共5页
Journal of Nuclear and Radiochemistry
基金
复旦大学青年科研基金
关键词
光纤
激光诱导荧光
铀
Optical fiber, Laser-induced fluorimetry, Uranium.
