微型反应堆主要用于热中子活化分析。在某些生物和地矿样品中,杂质元素含量和热中子吸收截面往往大于待测元素,因此用热中子辐照则很难甚至得不到待测元素的测量结果。在超热能区,有些待测元素的吸收截面却又明显大于杂质元素,因此只有利用超热中子辐照才会得到满意结果。应上 The microreactor is mainly used for thermal neutron activation analysis. In some samples of organisms and geology, the content of impurity elements and the thermal neutron absorption cross-section tend to be larger than the element to be measured, so it is difficult or even impossible to obtain the measurement result of the element to be measured with the thermal neutron irradiation. In the super-thermal zone, the absorption cross section of some elements to be measured is significantly larger than that of the impurity elements, so that satisfactory results can be obtained only by using the super-heated neutron radiation. Should be