Superheavy nuclei and hypernuclei: extending the limits of the nuclear chart

In this study, a tubular radon removal device and a movable one were prepared and investigated. The tubular radon removal device in an air conditioning return air system reduced the radon progeny by more than 84%. The radon progeny concentration reached equilibrium after 4 h when it was used only for a ventilation at the rate of 10 h^?1. Radon progeny removal efficiency was above 95% for the movable radon removal device, when the ventilation rate was 17 h^?1. The results showed that the radon removal devices can effectively remove the radon progeny in the air.