【摘要】 本文介绍反应堆中子活化分析中核素的复合参数K₀因子的测量方法及简要原理。给出了19种核素的K₀实测值。结果与文献值作了比较,对大多数核素而言,在5％内吻合。更多还原

【Abstract】 K, values of 19 nuclides used in reactor neutron activation analysis are determined. These isotopes include 24Na,46Sc, 51Cr, 60Co, 50Fe, 65Zn,72Ga, 95Zr, 103Ru, 110mAg,122Sb,124Sb,l40La,141Ce,147Nd,181Hf,182Ta, 187W. The definition of K0 and measuring method are based on those of Simonits’with certain modifications, e.g, most irradiation target samples are prepared with solution dropped on the aluminum foil. The thermal flux and epithermal flux are obtained using the linear least square method by the activation rates of a set of isotopes instead of three isotopes or Cd-ration measurement. The irradiation period is about 10 hours.γ-rays are measured with Ge(Li) detector. The efficiency of detector is calibrated with standard γ-sources. The accuracies of K0 are less than 5%, These results agree with F. De Cortes’ within 5% for most K0,更多还原