Performance study on a variety of radon measurement instruments in measurement of rapid changes of radon concentration

Objective: To compare the performance and measurement results of three types of radon measuring instruments FD3017. RAD7 and Alpha GUARD which are commonly used for field radon measurement. Methods: A common radon room and abasement with high radon soil were selected for field measurement of the radon gas and comparison. Results: The measurement results of the three radon monitor are only affected by radon which remains in the device after measuring radon in the low to high radon environmental. Besides, RAD7 radon monitor is also influenced by the concentration of short-lived radon progeny which has accumulated in the detector, and also, affected by the short-lived daughters of Th. In 'high to low' radon concentration process of the Alpha GUARD radon monitor, the higher the radon concentration, the farther deviate from the true value for the device indication or even to be collapsed. Conclusion: Under the condition of rapid changes in radon concentration, FD3017 has higher stability, and others suffered different degree influences. (authors)