Spatial Distribution of ²²⁰Rn Equilibrium Factor in Dwellings Structure With Soil in Hengshui

Passive method and positive measurement were used to measure ²²⁰Rn and its daughters equilibrium equivalent concentrations (EEC_Tn), and equilibrium factors of ²²⁰Rn for different distances from different sources were calculated based on the measurement. The equilibrium factors of ²²⁰Rn are 0.003-0.065 by passive measurement and 0.008-0.045 by positive measurement, respectively. The equilibrium factor of ²²⁰Rn appears a certain regular change in the spatial distribution.