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一、引言热中子的散射模型对计算反应堆的热中子谱有着重要的作用,而扩散参数的测量是检验散射模型的手段之一。为此我们采用中子管作脉冲中子源,对若干含氢介质的扩散参数进行了测量。密封中子管式的脉冲中子源具有便于移动,使用方便,造价低廉等优点;缺点是产额较低。为了检验中子管能否用来测量含氢介质的扩散参数,并达到一定精度,我们选择了比较差的实验条件,首先对轻水作了试测,本文将介绍实验设备,实验条件和所得结果。
I. Introduction The thermal neutron scattering model plays an important role in calculating the thermal neutron spectrum of the reactor. The measurement of the diffusion parameter is one of the means to test the scattering model. For this reason, we use neutron tube as a pulsed neutron source to measure the diffusion parameters of some hydrogen-containing media. Sealed neutron tube pulse neutron source has the advantages of easy to move, easy to use, low cost and other advantages; the disadvantage is the lower yield. In order to test the neutron tube can be used to measure the diffusion parameters of hydrogen-containing medium, and to a certain degree of accuracy, we have chosen a relatively poor experimental conditions, the first light of the test, this article will introduce the experimental equipment, experimental conditions and income result.