A radiation imager including: a reading block; a first substrate; a plurality of portions made from a first material with a first optical index between the first substrate and the reading block; a second material at a periphery of at least one of the portions, the second material having a second optical index lower than the first optical index; and areas made from a third material surrounding at least ends of the portions oriented on a same side as the reading block, the areas made from a third material obtained by applying a layer made from a third material to the reading block and penetration of the end of the at least one portion made from a first material in the layer made from a third material.
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