[脳に選択的にマイクロ波放射を受けたラットにおける体温の時間的変化] med./bio.

To measure real-time cortical and colonic temperature changes in rats irradiated for 20 min by a 2450 MHz contact radiator at the animals head.

• 動物
• rat/Wistar
• 身体の一部: head

Lower power densities (up to 0.7 mW/cm²) yielded a small cortical temperature increase below that for the body core whereas higher power densities produced a greater temperature rise of the cortex (the rise in cortical temperature surpassed that for the colonic temperature). Even at an incident power density as high as 875 mW/cm² (that resulted in a SAR of 70 mW/g in the brain) the cortical temperature increased by less than 3.0°C while the colonic temperature rose by 0.5°C. The temperature of the cortex rapidly rose during the initial transient period of exposure. It soon became nonlinear and achieved a steady-state level around 39°C. From these observations the authors concluded that the brain temperature was lowered by thermoregulatory processes involving blood circulation, temperature, and mass differences between the brain and the non-exposed body of the animals, and furthermore, the exposed brain received significant protection from the nonirradiated body.