FIELD: physics.
SUBSTANCE: molecular hydrogen or deuterium inclusion concentration is maintained within 1·1019 to 5·1021cm-3 range in core and shell of fiber light guide. During light guide operation molecular hydrogen or deuterium is fed under pressure not less than 1 MPa to a cavity formed in the shell and/or protection coating. Medium for molecular hydrogen or deuterium spill prevention or impediment from the cavity through light guide end surfaces is provided.
EFFECT: enhanced light guide resistance to nuclear or ionising radiation by molecular hydrogen or deuterium concentration regulation (replenishment along reduction) in light guide glass during operation.
42 cl, 8 dwg
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