一、引言由于固体径迹探测器的发展,在地质学和考古学中出现了测定年代的裂变径迹法,在分析化学中,出现了测定微量或痕量铀的径迹活化法。这些方法正在从研究阶段逐步进入常规使用阶段。这些测量所使用的样品,首先必须放入反应堆用热中子进行照射,并测定照射到样品上的中子通量。因此,测量中子通量是这些工作不可缺少的重要环节。 I. INTRODUCTION Due to the development of solid track detectors, fission track methods have been developed in geology and archeology for dating. In the analytical chemistry, a trace activation method for the determination of trace or trace uranium appears. These methods are gradually moving from the research phase to the regular use phase. The samples used for these measurements must first be placed in the reactor to be irradiated with thermal neutrons and the neutron flux applied to the sample measured. Therefore, the measurement of neutron flux is an indispensable part of these tasks.