マイクロ波の強度-生存時間関係に関する研究
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概要
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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 rats entire body under various power densities. Each exposure group consisted of five rats.The results obtained were as follows.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.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).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.4) Concerning rats weighing less than 315g, the LD50 value was less than 10mW/cm2 at the ambient temperature of 22°C.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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