DIN EN 60544-4-2004 电气绝缘材料.测定电离辐射的影响.第4部分:在辐射环境中工作的分类系统
Electrical insulating materials - Determination of the effects of ionizing radiation - Part 4: Classification system for service in radiation environments (IEC 60544-4:2003); German version EN 60544-4:2003