Study of the Influence of the Orientation of 50 Hz Magnetic Field on the Fetal Exposure using Polynomial Chaos Decomposition

Human exposure modelling is a complex topic because in a realistic exposure scenario several parameters morphology of subjects) vary and influence the . Deterministic dosimetry, so far used to analyze human exposure to , is highly time consuming if the before mentioned variations are considered. Stochastic dosimetry is an alternative method to build analytical approximations of exposure at a lower computational cost. In this study, it was used to assess the influence of magnetic flux density (B) orientation on fetal exposure at 50 Hz by Polynomial Chaos (PC). A PC expansion of induced electric field (E) in each fetal tissue at different gestational ages (GA) was built as a function of B orientation. Maximum E in each fetal tissue and at each GA was estimated for different exposure configurations and compared with the limits of ICNIRP Guidelines 2010. PC theory resulted in an efficient tool to build accurate approximations of E in each fetal tissue. B orientation strongly influenced E, with a variability across tissues from 10% to 43% respect to the mean value. However, varying B orientation, maximum E in each fetal tissue was below the limits of ICNIRP 2010 at all GAs.