[Shielding of the geomagnetic field in apartment houses].

The present investigation has studied the specific features of shielding of the natural geomagnetic field (GMF) in the multistorey apartment houses. The results of the experimental study of the shielding properties of some building materials are presented. It is shown that there are 1.2 to 2.0-fold reductions in GMF induction within the houses depending on the number of storeys and the properties of building materials. The level of GMF within the multistorey apartment house decreases by an average of 27.2+/-0.5 microTl from the 1st to the 9th floor and the GMF attenuation factor in many apartment houses exceeds the permissible limit for working places, especially on the top floors. On designing new building materials and constructions and on architectural design, one should keep in mind their shielding properties.