マイクロ波の強度‐生存時間関係に関する研究

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  • Study on the relationship between microwave dose and survival time.
  • マイクロハ ノ キョウド セイゾン ジカン カンケイ ニ カンスル ケンキュウ

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To investigate the microwave dose-death relationship, animal experiments concerned with ambient temperature and body size were performed. Microwaves with a frequency of 2, 450MHz were radiated on the rat's entire body under various power densities. Each exposure group consisted of five rats.<br>The results obtained were as follows.<br>1) For rats weighing 185-215g, mean time to death was related to microwave power density. The highest power level (100mW/cm2) resulted in the shortest time to death (8.0min) at the ambient temperature of 22°C. There was no significant relationship between the power density and the rectal or brain temperature at death. However, brain temperature was slightly lower than rectal temperature.<br>2) For rats weighing 185-215g, mean time to death was related to ambient temperature. The highest ambient temperature (22°C) resulted in the shortest time to death (12.7min) at the power density of 50mW/cm2. Rectal temperature at death was also related to ambient temperature. The highest ambient temperature (22°C) resulted in the lowest rectal temperature (45°C).<br>3) Mean time to death of rats was related to body weight. The heaviest body weight (590-610g) resulted in the longest time to death (25.2min), at the power density of 50mW/cm2 under the ambient temperature of 22°C. However, no relationship was observed between rectal temperature and body weight when the rats died.<br>4) Concerning rats weighing less than 315g, the LD50 value was less than 10mW/cm2 at the ambient temperature of 22°C.<br>From these results, it is concluded that ambient temperature and body weight must be taken into consideration in the evaluation of the permissible level of microwave.

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