IEC 60544-4:1985 Guide for determining the effects of ionizing radiation on insulating materials. Part 4 : Classification system for service in radiation environments
2003IEC 60544-4:2003 Electrical insulating materials - Determination of the effects of ionizing radiation - Part 4: Classification system for service in radiation environments
1985IEC 60544-4:1985 Guide for determining the effects of ionizing radiation on insulating materials. Part 4 : Classification system for service in radiation environments