Reaffirmed 2017

NATIONAL FOREWORD

This Indian Standard (Part 1) which is identical with IEC 60544-1(1994) ‘Electrical insulating materials - Determination of the effects of ionizing radiation - Part 1: Radiation interaction and dosimetry’ issued by the International Electrotechnical Commission (lEC) was adopted by the Bureau of Indian Standards on the recommendation of the Solid Electrical Insulating Materials Sectional Committee and approval of the Electrotechnical Division Council.

The text of IEC Standard has been approved as suitable for publication as Indian Standard without deviations. Certain conventions are not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’; and

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.

Only the English text in the IEC Publication has been retained while adopting it in this Indian Standard, and as such the page numbers have been given afresh here since they are not the same as in IEC Publication.

It is necessary to define the radiation fields in which materials are exposed and the radiation dose subsequently absorbed by the material.

‘Temperature of operation’, composition of the ‘surrounding atmosphere’ and the time interval during which the total dose is received (dose is rate of flux) are important factors which also determine the rate and mechanism of chemical changes.

The establishment of suitable criterion for the evaluation of the radiation resistance of insulating materials depends upon the conditions under which the materials are used. For instance, if an insulation of the cable receives a radiation dose sufficient to reduce to a specified value one or more of the mechanical properties.