裂变产物核161Tb衰变的γ射线能量主要都在100keV以下。这些低能γ射线发射率的精确测量对于核技术应用具有重要意义。我们采用直接测量源活度和γ射线强度的方法来提高γ发射率测量值的准确度。靶材料经反应堆中子照射后,通过核反应过程160Gd(n,γ)161Gdβ-3.7min→161Tb产生1 The fission product nuclear 161Tb decay gamma ray energy is mainly below 100keV. The accurate measurement of these low-energy γ-ray emissivities is of great importance for nuclear technology applications. We use methods that directly measure source activity and gamma-ray intensities to improve the accuracy of gamma emissivity measurements. After the target material is irradiated by the reactor neutrons, a nuclear reaction process 160Gd (n, γ) 161Gdβ-3.7min → 161Tb produces 1