水氡闪烁室排气定时开关控制装置研究 A Study on Device of Timer Control Means for Water Radon Exhaust in Scintillation Chamber

水氡模拟测量是一种主要依靠人工采样操作提取观测样本的测量手段，在观测完成后，密闭在闪烁室内的放射性气体必须全部排出，以达到闪烁室内气体成分与自然空气相近。当前使用的排气方法效率较低，在气温低、气体密度高等某些特殊情况下的排气效果不理想。长期工作经验积累发现，使闪烁室排气过程在【真空-进气】的状态下循环排气，用于脱气的定时自动控制进气/闭气的装置可以大幅提升排气效率、减小测量误差、提升工作效率、延长真空泵使用寿命。 The water radon simulation test is a kind of measurement, mainly relying on manual sampling operation to extract observed sample. After the observation, the radioactive gas sealed in the scin-tillation chamber must be completely discharged in order to let the indoor gas components be similar to the natural air. The exhaust method currently used has lower efficiency, and the emission effect is not ideal in some special cases such as the low temperature and higher gas density. Through the long-term accumulation of working experience, the author found that in scintillation chamber, if cycle exhaust was made under the status of [vacuum-inlet], the device of automatic timing control of intake/closing means used for degassing gas emissions can improve efficiency, reduce the measurement error, improve work efficiency and extend the service life of the vacuum pump.