SN EN 60793-1-54 : 2003

INTRODUCTION
1 Scope
2 Normative references
3 Apparatus
  3.1 Radiation source
       3.1.1 Testing of environmental background radiation
       3.1.2 Testing of adverse nuclear environments
  3.2 Light source
  3.3 Optical filters/monochromators
  3.4 Cladding mode stripper
  3.5 Fibre support and positioning apparatus
  3.6 Optical splitter
  3.7 Input launch simulator
       3.7.1 Category A1 fibres (graded index multimode fibre)
       3.7.2 Category B fibres (single-mode fibre)
       3.7.3 Categories A2.1 and A2.2 (quasi-step and step
             index fibres)
  3.8 Detector - Signal detection electronics
  3.9 Optical power meter
  3.10 Radiation dosimeter
  3.11 Temperature-controlled container
  3.12 Test reel
4 Sampling and specimens
  4.1 Specimens
       4.1.1 Fibre specimen
       4.1.2 Cable specimen
  4.2 Specimen for environmental background radiation test
  4.3 Specimen for testing adverse nuclear environments
  4.4 Test reel
  4.5 Ambient light shielding
5 Procedure
  5.1 Calibration of radiation source
  5.2 Preparation and conditioning
  5.3 Attenuation measurement for environmental background
       radiation
  5.4 Attenuation measurement for adverse nuclear environment
6 Calculations
  6.1 The change in optical attenuation [delta]A (environmental
       background radiation test)
  6.2 The change in optical transmittance, A (adverse nuclear
       environmental radiation test)
  6.3 Normalisation of the results
7 Results
  7.1 Information to be provided with each measurement
  7.2 Information available upon request
8 Specification information
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Specifies method for measuring the steady state response of optical fibres and optical cables exposed to gamma radiation. It can be employed to determine the level of radiation-induced attenuation produced in single-mode or multimode optical fibres, in either cabled or uncabled form, due to exposure to gamma radiation.