Abstract: A radiation receiver comprises an inner cylindrical part of insulating material having a closed end and an opposite end with a radially extending annular flange. At least one sensor is mounted on the inner part preferably on the closed end thereof and on its exterior. At least one conductor track lead provided on the inner part extending from the sensor on the exterior wall of the inner part and along the exterior of the flange. An outer cylindrical part having a closed end and an opposite open end has a rim surrounding the end which is engaged on the flange over the track at a location to leave an outer extending portion of the track extending outwardly from the exterior of said outer cylindrical part and along said flange. A glass solder seam seals the outer cylindrical part to the flange of the inner cylindrical part around the rim.