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许多作者已对云母探测裂变碎片的效率进行了测定。但都是对2π立体角进行的,这在某些场合并不适用。本文对白云母在小于2π立体角大气中探测裂变碎片的效率进行了测量和计算。 本工作的特点是利用若干等质量裂变靶(饱和厚度的ThO_2靶)在均匀中子场内照射相同时间,用相同的白云母作裂变碎片探测器,记录白云母与靶之间距离D取不同数值条件下的径迹密度。白云母上径迹密度随D的变化就直接表示云母探测效率的变化。
Many authors have determined the efficiency of mica in the detection of fission debris. However, all are 2π solid angle, which does not apply in some cases. In this paper, the efficiency of the detection of fission fragments from muscovite in the atmosphere of less than 2π solid angle is measured and calculated. This work is characterized by the use of a number of equal-quality fission targets (ThO_2 targets of saturated thickness) in homogeneous neutron fields irradiated at the same time, using the same muscovite as the fission debris probe, recording the distance D between the muscovite and the target Track density under numerical conditions. The change of track density of muscovite with D directly indicates the change of mica detection efficiency.