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本文描述一种由置于聚乙烯球腔内的慢中子探测器而组成的快中子监测器。聚乙烯球分为两个半球,外径为24.4厘米,厚度为6.2厘米,密度为0.92克/厘米~3,外包厚度为0.2厘米的两个镉制半球壳。中子能量在0.02～5兆电子伏之间,以BF_3计数器和~(235)U涤纶膜固体径迹探测器为中心探测器时,监测器的灵敏度在±15%和±12%以内为常数,其值为2.03计数/中子/厘米~2和1.13×10~(-6)径迹/中子;在15兆电子伏处,灵敏度下降约40%。源距大于80厘米,监测器的响应与距离的关系服从反平方律。监测器的角响应优于90%。该监测器可用于直接读数和累积读数。
This article describes a fast neutron detector consisting of a slow neutron detector placed in a polyethylene ball cavity. Polyethylene ball is divided into two hemispheres, an outer diameter of 24.4 cm, a thickness of 6.2 cm, a density of 0.92 g / cm ~ 3, outsourcing the thickness of 0.2 cm two cadmium hemispherical shell. When the neutron energy is between 0.02 and 5 MeV, the sensitivity of the detector is constant within ± 15% and ± 12% with the BF_3 counter and ~ (235) U polyester film solid track detector as the center detector , With values of 2.03 counts / neutron / cm 2 and 1.13 × 10 -6 tracks / neutron; at 15 MeV the sensitivity dropped by about 40%. Source distance greater than 80 cm, the monitor’s response and distance obey the anti-square law. The angular response of the monitor is better than 90%. The monitor can be used to read directly and accumulate readings.