【摘要】 介绍了一台测量板形铀元件大面积低水平表面铀污染测量仪。该装置探头是大面积多丝正比计数器,计数器阴极由低本底材料不锈钢制成的,窗由厚6μm双面镀铝的聚脂膜制成。阳极丝是0.025mm镀金钨丝。计数器灵敏面积为1113mm×100mm。实验表明,计数器固有本底为0.002计数/（min·cm²）（2计数/min）。对浓缩铀源,探测效率为67％,2π方向;24小时稳定度为0.84％（包括计数器、高压、电子学放大器、甄别器、微机、打印和显示系统）。该装置可探测的定量下限为(对20％²³⁵U,0.13％²³⁴U,79.64％²³⁸U)4.6×10^-10g/cm²。通过微机控制,该装置可预置定时,具有显示、自动报警、分类和打印功能。更多还原

【Abstract】 An apparatus for measuring uranium contamination of the surface of reactor plate component is described. The searching unit of the apparatus is a large surface multi-wire proportional counter. The cathode of the counter is made of stainless steel with low radioactive background, the window is made of film which is plated with aluminum about 6m; and the anode is mad by gild tungsten wire of 0. 025 mm diameter. The sensitive area of the counter is 1113mmx100mm. It has been shown that the intrinsic radioactive background of the apparatus is 0. 002cpm/cm2 (2 count/min). The detecting efficiency is 67% for enriched uranium source (2 n solid angle). The stability is 0. 84% within 24 hour (including detector, high voltage power supply, amplifier, discriminator, computer, typer and display system). The lower detection limit of the apparatus is 4.6dx10-10g/cm2(for20%235U, 0. 13% 234U, 79.64%238U). The apparatus can preset timing by a computer controlling, and it also has the following function: displaying, automatic alarming, classifing and typing the results.更多还原