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针对中子残余应力测量的需要,开发研制了低灵敏度3He计数管,主要功能是标定中子光路第1狭缝的中心及姿态及确定样品边界精确位置。另外,在实验过程中兼作监视器用来监视束流质量。该计数管的制备难点在于如何确定工作气体的配比和充气气压,解决途径是选取一较大体积的容器做气体混合配比试验,微调各气体成分并控制气压值范围,在大容器中完成气体配比后,再用此大容器向计数管内部充气。具体指标测试结果如下:1)活性区尺寸:φ50mm×100mm。2)坪区:1300～1400V,坪长100V,坪斜8.2%/100V。
In order to meet the need of neutron residual stress measurement, a low sensitivity 3He counter tube was developed. Its main function is to calibrate the center and attitude of the first slit in the neutron beam path and to determine the exact position of the sample boundary. In addition, during the experiment as a monitor to monitor the beam quality. The difficulty in preparation of the counter tube lies in how to determine the working gas ratio and inflation pressure. The solution is to select a larger volume of the container for the gas mixing ratio test, fine-tune the gas composition and control the pressure value range, and complete the large container Gas ratio, and then use this large container to counter the internal inflation. Specific indicators test results are as follows: 1) active area size: φ50mm × 100mm. 2) Ping area: 1300 ~ 1400V, Ping-long 100V, Ping oblique 8.2% / 100V.