General Dynamics Information Technology, 4141 Petroleum Road, JBSA Fort Sam Houston, TX, United States of America.
Radio Frequency Bioeffects Branch, 4141 Petroleum Road, JBSA Fort Sam Houston, TX, United States of America.
Biomed Phys Eng Express. 2024 May 17;10(4). doi: 10.1088/2057-1976/ad488e.
A study of burn thresholds from superficially penetrating radio-frequency (RF) energy at 8.2 and 95 GHz for swine skin was conducted. The study determined the thresholds for superficial, partial-thickness, and full-thickness burn severities after 5 seconds of exposure at power densities of 4-30 W/cmand 2-15 W/cmat 8.2 and 95 GHz, respectively. There were significant differences in he burn thresholds at the different severities between the two frequencies due to the large difference in energy penetration depths. Biopsies were collected from each burn site at 1, 24, 72, and 168 hr post exposure. Each sample was assessed by a burn pathologist against 20 histological factors to characterize the damage resulting from these RF overexposures. A one-dimensional, layered digital phantom that utilized realistic values for dielectric and thermal properties was used to explain some observed thresholds. The results of the heating and cooling response of the animal model and histology scores of each exposure are provided to enhance future efforts at simulation of RF overexposures and to establish damage thresholds.
对 8.2 和 95GHz 的射频（RF）能量对猪皮的浅表穿透进行了烧伤阈值研究。该研究确定了在分别为 4-30 W/cm^2 和 2-15 W/cm^2 的功率密度下，暴露 5 秒后，浅层、部分厚度和全层烧伤严重程度的阈值。由于能量穿透深度的巨大差异，两种频率的烧伤阈值在不同严重程度之间存在显著差异。在暴露后 1、24、72 和 168 小时，从每个烧伤部位采集活检样本。每个样本都由烧伤病理学家根据 20 个组织学因素进行评估，以表征这些 RF 过度暴露造成的损伤。使用具有实际介电和热特性的一维分层数字体模来解释一些观察到的阈值。提供了动物模型的加热和冷却响应以及每个暴露的组织学评分的结果，以增强未来对 RF 过度暴露模拟和建立损伤阈值的努力。
