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研制了一个适合于~(252)Cf裂变中子飞行时间谱测量的微型流气快裂变室。裂变室由不锈钢构成,壁厚0.14mm。~(252)Cf源通过自转移方法沉积在m24×0.09mm的不锈钢片上,源强4.16×10~3裂变/秒,源斑直径6mm。收集极为φ16×0.09mm的不锈钢片,极间距离2mm,收集极到地电容的测量值为1.7pF,裂变室总质量为1.65克。99.9%纯度的甲烷作为工作气体,并在～10~5Pa气压下通过毛细管连续流动。测量表
A microfluidic fast fission chamber suitable for ~ (252) Cf fission neutron time of flight spectroscopy was developed. Fissile chamber made of stainless steel, wall thickness 0.14mm. The ~ (252) Cf source was deposited on m24 × 0.09mm stainless steel by self-transfer method. The source intensity was 4.16 × 10 ~ 3 fission per second, and the source spot diameter was 6mm. A stainless steel sheet with a diameter of φ16 × 0.09 mm was collected at a distance of 2 mm between the electrodes. The measured value of the collector-to-ground capacitance was 1.7 pF. The total mass of the fission chamber was 1.65 g. 99.9% pure methane was used as the working gas and continuously flowed through the capillary tube at ~ 10 ~ 5Pa pressure. Measuring table