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一、引言用γ扫描方法测量活性区燃耗分布,在国外已广泛采用。它的优点是非破坏性测量,测量速度快,可以在短时间内给出整堆的燃托分布曲线。它已是动力堆中期换料常规检查项目之一。γ扫描原理如下:在铀、钚原子裂变时,同时产生多种有γ放射性的裂变产物,各种裂变产物的γ能量不同,用γ谱仪测出某一能量的裂变产物的数量,该数量正比于
I. INTRODUCTION It is widely used in foreign countries to measure the burnup distribution of active zone by γ-scan method. Its advantage is non-destructive measurement, measurement speed, can be given in a short time the entire pile of fuel distribution curve. It is one of the routine inspections of the power reactor medium-term refueling. γ scanning principle is as follows: uranium, plutonium atom fission at the same time produce a variety of γ-radioactive fission products, various fission products γ energy is different, γ spectrometer to measure the amount of fission products of a certain energy, the number Proportional to