This part of IEC 60793 outlines a 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 Class B single-mode or Class A, category
A1 and A2 multimode optical fibres, in either cabled or uncabled form, due to exposure to
gamma radiation.
The attenuation of cabled and uncabled optical fibres generally increases when exposed to
gamma radiation. This is primarily due to the trapping of radiolytic electrons and holes at
defect sites in the glass (i.e. the formation of “colour centres”). This test procedure focuses on
two regimes of interest: the low dose rate regime suitable for estimating the effect of
environmental background radiation, and the high dose rate regime suitable for estimating the
effect of adverse nuclear environments. The testing of the effects of environmental
background radiation is achieved with an attenuation measurement approach similar to
IEC 60793-1-40 Method A, cut-back. The effects of adverse nuclear environments are tested
by monitoring the power before, during and after exposure of the test sample to gamma
radiation. The depopulation of colour centres by light (photo bleaching) or by heat causes
recovery (lessening of radiation induced attenuation). Recovery may occur over a wide range
of time which depends on the irradiation time and annealing temperature. This complicates
the characterization of radiation induced attenuation since the attenuation depends on many
variables including the temperature of the test environment, the configuration of the sample,
the total dose and the dose rate applied to the sample and the light level used to measure it.
This test is not a material test for the non-optical material components of a fibre optic cable. If
degradation of cable materials exposed to irradiation is to be studied, other test methods will
be required.
This test method is written to contain a clear, concise listing of instructions. The background
knowledge that is necessary to perform correct, relevant and expressive irradiation tests as
well as to limit measurement uncertainty is presented separately in IEC/TR 62283.
Attention is drawn to the fact that strict regulations and suitable protective facilities are to be
adopted in the laboratory for this test. Carefully selected trained personnel shall be used to
perform this test. It can be extremely hazardous to test personnel if it is improperly performed
or without qualified conditions.