Anti-radiation viewing port

An anti-radiation viewing port intended to be fitted to a wall opening provided in a wall which separates a space subjected to ionising radiation, called a hot space, and a space which is not subjected to ionising radiation, called a cold space, said wall opening being delimited by a front wall face directed towards said hot space, by a rear wall face directed towards said cold space and by an opening edge connecting said front wall face and said rear wall face,

• said radiation viewing port comprising a screen made of a transparent radio-protective material delimited by a rear screen face intended to be directed towards said cold space, a front screen face intended to be directed towards said hot space, and a peripheral screen edge,
• said screen made of a transparent radio-protective material being associated with a peripheral attachment frame for screen's attachment to the periphery of said wall opening, wherein said peripheral attachment frame comprises:
• a rebate bearing wing against which the periphery of said rear screen face is intended to bear,
• a rebate periphery wing, opposite which the peripheral screen edge is intended to be positioned, a distance being provided between said rebate periphery wing and said peripheral screen edge,
• an attachment wing extending said rebate periphery wing, said attachment wing comprising an inner face intended to bear against said front wall face, and an opposite outer face,
• a joint structure being interposed between said rebate periphery wing and said peripheral screen edge, said joint structure comprising a front joint face extending between said front screen face and said attachment wing,
• said front screen face, said front joint face, and at least part of said outer face of the attachment wing which extends in continuation of said front joint face, being located in a same plane, or substantially in a same plane.