Facility for study of neutralization processes of radioactive ions in air

The experimental facility and methodology for measuring the lifetime of the ions of the 218Po radon daughter products decay (DPD) in the gas is described. The above methodology is based on the radioactive ions deposition on the detector surface in the electrostatic field with the subsequent 218Po α-radiation registration. The dependence of the 218Po ions neutralization probability on the air absolute humidity is obtained. It is established, that the change in the air humidity from 3 up to 20 g/m3 slightly effects the DPD transfer in the measuring chamber air in the absence of the electric field. The efficiency of the electrodeposition by the radon concentrations up to 3.0x104 Bq/m3 does not depend on the ion formation voluminous velocity. The average lifetime of the 218Po ions by the air humidity of 0.8 and 14 g/m3 constituted 2.4 and 0.9 correspondingly