報告書番号

H06004

タイトル（和文）

非一様磁界中の人体ばく露に関する簡易評価手法（３）－さまざまなばく露条件への適用と統合ツールの開発－

タイトル（英文）

Simple Evaluation Method for Human Exposure to Non-uniform Magnetic Field: Part III - Application to Various Exposure Conditions and Development of EMF Integrated Tool -

概要 （図表や脚注は「報告書全文」に掲載しております）

人体防護指針においては体内誘導電流が影響の評価指標とされ，一様な磁界へのばく露が想定されているが，磁界発生源のごく近傍では磁界が一様ではないため，これを簡便に評価する手法が望まれている。本報告では，想定されるさまざまな非一様磁界ばく露条件に対し本手法が適用可能であることを示すともに，本手法に基づくツールの開発を行った。主たる成果は以下のとおり。
１．半径20cmの均質球を用いて，非一様磁界ばく露を簡便に評価する提案手法が，さまざまな形態の磁界発生源（頭部近傍の単線電流路，往復電流路，磁気ダイポール等）の近傍に配置した人体詳細モデルに対しても適用できることを示した。
２．提案手法に基づく誘導電流評価の統合ツールの開発を行い，防護指針との適合性評価を容易にした。

概要 （英文）

Regarding compliance testing with existing guidelines on human exposure to ELF (extremely low frequency) magnetic fields, the nonuniformity of the fields has been one of the major concerns since guideline-level exposures are generally encountered in the immediate vicinity of magnetic field sources such as electric power facilities and electric appliances. According to the guidelines, when the measured maximum magnetic fields exceed the specified field level, induced currents inside human bodies are to be investigated to check their conformity. However, this calculation still needs verification and requires massive computational resources, which are not readily applicable under practical exposure conditions. Therefore, a simple and relevant method of assessing nonuniform magnetic field exposure is highly desirable. In the present study, the proposed method was solidified by additional verifications for anticipated various kinds of exposure conditions such as near multi-phase conductors and electric appliances. In addition, an EMF integrated tool, which contains calculation program of magnetic fields and the normalized induction factors based on the proposed method, was developed to ease the compliance testing.

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