Theoretical and experimental studies have been made on radon progeny deposition enhancements in static and AC electric fields in a stagnant environment using a modified cylindrical scintillation cell. It consists of a wire coated with zinc sulphide as a central electrode to which the electric fields are applied and the alpha scintillations due to radon and its progeny present in the cell are recorded by a Photo-Multiplier assembly. A generalised approach based on average volumetric displacements of charged particles across equipotential surfaces is presented for calculating the deposition fractions in the presence of static and AC fields. From this, formulae have been derived relating the observed count rates and the enhancement Factors (EF) to the applied potential, progeny mobility and the charge lifetimes. The formulae for the case with AC field predict a linear variation of EF with the applied potential, regardless of the charge neutralization rate. Measurements of EF carried out with AC fields in 100% humid air containing radon, although limited to a range of 50-240 V (rms), confirm the validity of the linear enhancement theory. From the slope of this line, and the variations of EF observed in static field experiments, a mobility of 1.14 +/- 0.2 cm(2) V-1 s(-1) and a charge lifetime of 0.014 +/- 0.002 s was obtained by fitting with the theoretical formulae. As these values are in reasonable agreement with the earlier values obtained by spectrometric methods, it demonstrates the use of AC field techniques for these estimations, in stagnant air. Application of this technique for these studies under different environmental conditions, is suggested.