The discussion on radioactive equilibrium variation in airtight radon chamber

The dynamic and steady technology was used to achieve airtight radon chamber in which the radon concentration could be in stability, and the variation of the radon and its short-lived daughters was derived. By detailedly analyzing the radioactive equilibrium variation in airtight radon chamber in the process of first and midway radon supplement, radon and its short-lived daughters in the radon chamber would be in long-term equilibrium or near equilibrium state after the airtight radon chamber was in radioactive equilibrium period, and the radon chamber in this state could be carried out to develop instrument calibration work, adjust bound share experiment and so on. The research methods and results would provide a method and theoretical basis for further developing the potential concentration control of radon daughters, radioactive aerosol concentration control and dynamic behavior study of radon daughters. (authors)