携帯電話機の高周波電磁場が電子ポケット線量計に及ぼす影響

抄録

Electric field strength distribution around the digital cellular telephone (cell phone) transmitting 1.5GHz band was analyzed by using an isotropic probe. Five types of electronic pocket dosimeters (EPDs) were exposed to the fields for 50sec under four kinds of configurations relative to the cell phone. The field distribution expanded around the antenna and had a maximum strength level of 36.5±0.3V/m.The cell phone caused abnormally high values (wrong dosages) to four EPDs out of five due to electromagnetic interference.Three out of the four EPDs exceeded the upper limits of dose range depending on the configurations, and the maximum value of wrong dosage among the EPDs was 1, 283μSv. The minimum distance preventing electromagnetic interference (protection distance) differed with each EPD and ranged from 2.0cm to 21.0cm. The electromagnetic immunity levels of EPD-1, 2, 3, 4 and 5 were 13.3, ≤35, ≤32, 9.2 and≤35 V/m, respectively. Although the immunity levels were either equal to or greater than the IEC-standard level, those of the EPDs should be enhanced greater than the IEC-standard from the standpoint of radiation protection.