ELF Magnetic Field Environment and Its Impact to Biosystems

今年，根据去年开发的设计单，设计和制造了20台便携式ELF磁场剂量计。满足电气性能要求，最终性能如下：（1）尺寸：135 mm × 90 mm × 35 mm（含电源）（2）重量：含电源约250 g（3）实测值：三个正交分量独立的时间积分值（4）磁通密度：0.02-550微特斯拉（5）积分值：0.01-1999微特斯拉-小时（6）持续时间：30小时连续使用现有剂量计的几次现场测量显示剂量计存在一些机械缺陷，剂量计仍在建造中。另一方面，在印度尼西亚和日本，在500 kV架空输电线路下、500 kV变电站区域和居民区进行了工频磁场调查。通过本课题的研究，获得了有关极低频磁场特性的一些有价值的数据。在印度尼西亚万隆举行的“印度尼西亚电磁场的生物效应研讨会”上介绍了本调查的一部分。

In this year, twenty of the portable ELF magnetic field dosimeters have been designed and manufactured based on the design sheet developed last year. They satisfy the electrical performance required, and the final performance is as follows :(1) Size : 135mm x 90mm x 35mm (including the power supply)(2) Weight : about 250g including the power supply(3) Measured values : time-integrated values of three orthogonal components independently(4) Magnetic flux density : 0.02-550 micro tesla(5) Integrated values : 0.01-1999 micro tesla-hour(6) Time duration : 30 hours continuouslyA couple of on-site measurements using the present dosimeters reveal some mechanical defects of the dosimeter, and the dosimeters are still under construction. Consequently no systematic data on the dose characteristics expected are not yet obtained, and further investigation will be required.On the other hand, power frequency magnetic field survey has been conducted under 500kV over-head power transmission lines, in the 500kV power substation area and in the residential area, all in Indonesia as well as in Japan. Some valuable data on the elf magnetic field characteristics have been obtained from the present project. A part of the present survey was presented at "Seminar on Biological Effects of EMF in Indonesia" held at Bandung, Indonesia.