We have not proved higher radon daughter exposure to internal body organs by exposure near EM-fields. However, the weight of evidence of possible mechanisms makes it likely that there will be either enhanced inhalation or greater deposition of radon daughter aerosols in the oral cavity, the pharyngeal, bronchial or lung parenchyma regions. The mechanism should also be of relevance to aerosols in general. For example, a smoker exposed under power lines may retain more inhaled cigarette smoke, in principal increasing his lung cancer risk. The current findings relate to the electric component of electromagnetic radiation.
Further experiments are in progress to evaluate the effects of time-varying magnetic fields.
It should be noted here that radon daughter exposure outdoors can be significant. The phenomenon of attraction of radon daughter aerosols to wires carrying 50 Hz potential shown in figures 2 and 4 need to be clearly understood. These examples are short range effects, confined to close to the wires themselves and presumably do not result in higher airborne exposure to a person situated nearby. This is presumably due to variations in the ultrafine fraction in the two houses and emphasises the well-known importance of the ultrafine and attached radon daughter aerosols in affecting lung deposition. It is from the above considerations that the possible mechanisms of increased internal dose can be conveniently split into the build-up of radon daughters aerosols in air or the greater deposition of those aerosols that are inhaled.