诺瑞防辐射产品有限公司 1 第1 章 电磁辐射的原理 ................................................................................................................... 3 1 .1 电磁辐射的概述 ................................................................................................................... 3 1 .1 .1 电磁辐射的定义 ........................................................................................................ 3 1 .1 .2 电磁辐射产生的条件 ............................................................................................... 4 1 .2 电磁辐射的来源 ................................................................................................................... 4 1 .2 .1 天然电磁辐射： ........................................................................................................ 4 1 .2 .2 人造电磁辐射： ........................................................................................................ 5 1 .3 电磁辐射的单位和测量标准 ............................................................................................... 5 1 .3 .1 电磁辐射的单位 ........................................................................................................ 5 1 .3 .2 电磁辐射的测量标准 ................................................................................................ 5 1 .4 电磁辐射区场的划分 ........................................................................................................... 6 1 .4 .1 近区场及特点 ............................................................................................................ 6 1 .4 .2 远区场及特点 ............................................................................................................ 7 1 .4 .3 .近区场与远区场划分的意义 .................................................................................... 7 1 .5 电磁强度的分级标准 .................................
