FIELD: ionizing radiation protective means.
SUBSTANCE: proposed viewing port of radiation-shielding chamber has glass plate blocks placed in casing. Block is installed at chamber inner space side for its replacement within chamber and has at least one glass plate whose glass density is minimum 4.7 g/cm3. Glass plate thickness amounts to minimum 10% of total thickness of glass plates in all blocks.
EFFECT: reduced material input and time requirement.
2 cl, 3 dwg
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