激光诱导击穿光谱在铅堆杂质测量的应用研究

Study on application of laser-induced breakdown spectroscopy in impurity measurement of lead-based reactor

铅基堆被第四代核能系统国际论坛组织评定为有望首个实现商业应用的第四代堆,铅基堆冷却剂中杂质的存在会严重影响铅反应堆的安全运行。基于此,文中开展了脉冲激光诱导击穿光谱(LIBS)在铅铋合金中杂质测量中的应用研究。研究了激光聚焦位置、激光能量和延迟时间对Ni元素光谱信号的影响,获取了LIBS测量铅铋合金中杂质的最佳实验参数。同时使用不同Ni含量的实验样品完成了LIBS对铅铋合金中Ni元素的定量研究,获得了定量标准曲线,相关指数R2达到0.967,质量含量的探测限为0.028 7%。结果表明:使用激光诱导击穿光谱技术进行铅铋合金中的杂质测量是可行的。可以推测,LIBS技术在先进核能领域有比较高的应用研究价值。

Lead-based reactor is rated as the first fourth-generation reactor expected to achieve commercial application by Generation IV International Forum(GIF). The coolant of lead-based fast reactor can corrode metals. The existence of impurities in coolant will affect the safe operation of the lead-based reactor. Under this background, the application of impurity measurement in lead-bismuth alloy with laser-induced breakdown spectroscopy(LIBS) technique was studied. The effects of laser focusing position, laser energy and delay time on Ni elements spectral signal were studied. The optimal experimental parameters for measuring impurities in leadbismuth alloy with LIBS device were obtained. At the same time, quantitative analysis of Ni element in leadbismuth alloy was performed by employing LIBS technique in the present paper. The coefficients of determination gained by internal standard method is 0.967. The detection limit of mass content is 0.028 7%. The results show that it is feasible to use the laser-induced breakdown spectroscopy technique to measure impurities in lead-bismuth alloy. LIBS technique has high application research value in the field of advanced nuclear energy.