Abstract: The detection of radium content plays an important role in uranium exploration, radioactive environment monitoring and evaluation. Therefore accurate detection of radium is of great significance. Based on the emenation scintillation method, a radium pre-concentration device in water and a radium radon detection instrument were developed. An acurate concentration measurement system of radium-226 was established. The problems such as inaccuracy of flow control, incomplete radon collection and difficult to detect system pressure in traditional experimental methods are solved. The results show that the proposed system has good measurement accuracy and stability, and the measured recovery rate is 87.5%-101%, which is 4.79%-8.39% higher than that of the traditional experimental method.

Key words: Emanation scintillation method, Automatic air supply, ²²⁶Ra