The human dosimetry for electromagnetic field exposure is an essential task to develop exposure guidelines/standards for human safety as well as product safety assessment. At frequencies from a few 100 Hz to 10 MHz, the adverse effect to be protected is the stimulation of the peripheral nervous system. The in situ electric field in the skin is used as a surrogate of nerve activation. In the low-frequency dosimetry, a high but inaccurate in situ electric field has been reported at positions where a skin-to-skin contact exists, whose relation to the stimulation is controversial. One of the reasons for high electric fields may be attributable to the current resolution of anatomical models. In this study, we first evaluate the stimulation threshold at postures of skin-to-skin contact experimentally for different hand/finger positions to represent skin touching/nontouching scenarios. We confirm that the skin-to-skin contact does not lower the threshold current of magnetic stimulation devices needed to induce pain. Second, a new method is proposed for hand modeling to configure different finger positions using static hand models with similar postures to the experiments. We compute the in situ electric field at skin-to-skin contact for the different hand posture scenarios that indicate an excessive raise of the electric field in skin-to-skin regions that is not justified by the experiments. The comparison suggests that a high in situ electric field in the skin would be caused by poor modeling of the skin layers, which is not enough to represent in a resolution of the order of a millimeter. This skin-to-skin contact should not be considered to set the restriction in the international exposure guidelines/standards as well as product safety assessment.

中文翻译：

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皮肤对皮肤接触对刺激阈值和剂量测定的影响

人体电磁场暴露剂量测定是制定人体安全暴露指南/标准以及产品安全评估的一项基本任务。在 100 Hz 到 10 MHz 的频率范围内，要保护的不利影响是刺激周围神经系统。皮肤中的原位电场用作神经激活的替代物。在低频剂量测定中，据报道在存在皮肤与皮肤接触的位置存在高但不准确的原位电场，其与刺激的关系存在争议。高电场的原因之一可能是解剖模型的当前分辨率。在这项研究中，我们首先通过实验评估不同手/手指位置的皮肤接触姿势的刺激阈值，以表示皮肤接触/非接触场景。我们确认皮肤对皮肤的接触不会降低诱发疼痛所需的磁刺激装置的阈值电流。其次，提出了一种新的手部建模方法，使用与实验相似的静态手部模型来配置不同的手指位置。我们计算了不同手部姿势场景的皮肤与皮肤接触处的原位电场，这些情况表明皮肤对皮肤区域中的电场过度升高，这不是由实验证明的。比较表明皮肤中的高原位电场可能是由于皮肤层的不良建模​​造成的，这不足以以毫米量级的分辨率表示。这种皮肤对皮肤的接触不应被视为国际接触指南/标准以及产品安全评估中的限制。