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本实验室设计研制了一台圆柱型无壁组织等效正比计数器。该计数器由直径为0.3mm 不锈钢阳极丝及其周围16根直径为0.1mm 不锈钢阴极丝组成。计数器灵敏体积直径为20mm,高20mm。计数器置于近乎球形的直径为600mm 的不锈钢密闭容器内,待测点源的最大移动范围约为300mm。实验表明,组织等效气体压力为25和100mmHg 时,计数器分辨率分别为16.9和11.8%;8小时稳定度为±0.54%(包括计数器高压及电子学记录系统);线能量测量下限为0.1keV/μm。
The laboratory designed and developed a cylinder-type wall-free equivalent proportional counter. The counter consists of a diameter of 0.3mm stainless steel anode wire and its surrounding 16 diameter of 0.1mm stainless steel cathode wire composition. Counter sensitive volume diameter of 20mm, 20mm high. The counter is placed in a nearly spherical stainless steel closed vessel with a diameter of 600 mm. The maximum displacement of the point source to be measured is about 300 mm. Experiments show that when the equivalent gas pressure of tissue is 25 and 100mmHg, the resolution of counter is 16.9 and 11.8% respectively; the stability of 8 hours is ± 0.54% (including counter high pressure and electronic recording system); the lower limit of line energy measurement is 0.1keV / μm.