接触電流による体内電界評価とその電気安全への適用: 電磁界防護における計算手法を用いた電気安全パラメータの算出

摘要

各種環境における低周波（概ね100kHz以下）の電磁界の人体安全性評価の拠りどころとして，ICNIRP(国際非電離放射線防護委員会)やIEEE(米国電気電子学会)による電磁界の人体防護ガイドラインが用いられている。%In the guidelines limiting exposure to electromagnetic fields, contact current limits are specified to avoid indirect effect caused by touching to a conductive object where the electric potential of the object is different from that of the human body. In this study, electric fields inside human body caused by the contact current with amplitude of its reference level are calculated using SPFD method. The results are compared with the limit value (basic restrictions) of the guidelines and showed that the electric fields in the brain, heart, and nerves did not exceed the limit value, while electric fields in the skin adjacent to contacting point could exceed the limit value. In addition, the electrical quantities obtained in this study were applied to calculation of parameters used in the field of electrical safety where currents passing through the heart are focused to avoid cardiac fibrillation.