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本工作研制了具有特殊形状的表面沾污监测仪,探头方向可改变,并可拉伸,能用于监测管道内部,容器内部或其它不规则表面的沾污.探头采用J418型不锈钢云母端窗计数管,有效窗口为φ15mm和面积为70×70mm两种,端窗上复盖一层0.98mg·cm~(-2)厚的铝化聚脂膜.探头拉杆长度可从20cm伸长到100cm.该监测仪小探头(φ15)的表面活度响应对~(90)Sr+~(90)Y,~(204)Ti,~(147)Pm和~(241)Am源分别为0.55、0.47、0.14和0.19CPS/Bq·cm~(-2);测量时间10秒时,最小可探测限分别为0.32,0.39,1.60和0.42Bq·cm~(-2),满足退役设备去污监测的要求.
This work has developed a special shape of the surface contamination monitor, the probe can change the direction, and can be stretched, can be used to monitor the interior of the pipeline, the container or other irregular surface contamination.The probe using J418 stainless steel mica end window Counting tube, the effective window is φ15mm and an area of 70 × 70mm, the end window covered with a layer of 0.98mg · cm ~ (2) thick aluminized polyester film rod length can be extended from 20cm to 100cm The surface activity response of the small probe (φ15) of this monitor was 0.55, 0.47 for the 90 Sr, 90 Y, 204 Ti, 147 Pm and 241 Am sources, respectively. 0.14 and 0.19CPS / Bq · cm ~ (-2) respectively. The minimum detectable limits were 0.32, 0.39, 1.60 and 0.42Bq · cm ~ (-2) at 10 seconds. .