钍是钚产品中需要控制的杂质元素之一,需要准确测定。由于钚的基体干扰,同时又具有很强的α放射性和毒性,所以钚产品中微量钍的分析比较困难,建立一个灵敏度高的钚中钍的分析方法很有必要。研制了封闭式钍荧光分析仪。采用LED灯作激发光源并将其固定样品池上,提高了入射光强度及样品的荧光信号强度;采用高灵敏的热电致冷型光谱仪,降低了仪器的暗电流噪声,提高了仪器的灵敏度;采用光纤传导光信号,使样品室易于封闭。 Thorium is one of the impurity elements that need to be controlled in plutonium products and requires accurate determination. The analysis of trace thorium in plutonium products is difficult due to the matrix interference of plutonium and the strong alpha radioactivity and toxicity. Therefore, it is necessary to establish a sensitive analytical method for thorium in plutonium. Developed a closed-type thorium fluorescence analyzer. Using LED lamp as the excitation light source and fixing it on the sample cell, the intensity of incident light and the fluorescence signal intensity of the sample are improved; the highly sensitive thermoelectric refrigeration spectrometer is adopted to reduce the dark current noise of the instrument and improve the sensitivity of the instrument; Optical fiber optical signal, the sample chamber is easy to close.