Experimental study on the peaks overlap factor in the continuous measurement of ²²²Rn/²²⁰Rn progeny gathering α energy spectrum

In order to smoothly develop the α spectroscopy-based continuous measurement instrument of ²²²Rn/²²⁰Rn progeny, the research of peak overlap factor of α spectroscopy achieved by the continuous measurement instrument was performed. The ²²²Rn chamber(national standard), ²²⁰Rn chamber were used as measurement environment of pure ²²²Rn, ²²⁰Rn progeny respectively, and the peaks overlap factors have been calculated by α energy spectrums of ²²²Rn(or ²²²Rn) progeny, which was gathered from the measurement environment by the continuous measurement instrument of ²²²Rn/²²⁰Rn progeny in the radon laboratory of university of south china. The results showed that: Under the non vacuum condition, the probability of 8.78 MeV α particle emitted by ²²⁰Rn progeny ThC' (²¹²Po) slowing down to the 7.69 MeV α particle counts region, and the 7.69 MeV alpha particle emitted by ²²²Rn progeny RrC' (²¹⁴Po) slowing down to the 6.00 MeV α particle counts region can not be ignored. But the probability of 8.78 MeV α particle slowing down to the 6.00 MeV α particle counts region is very small; A membrane filter reuse don't result in peaks overlap factors θ₁, θ₂ and θ₃ significant changes, and can take 0.0335, 0.1791 and zero as typical values respectively; The contribution to the instrument measurement error from membrane changing is limited, since the different membrane peaks overlap factor differences within 2%. (authors)