Abstract: The invention provides a method for producing radiolabeled tyrosine derivatives with good purity and stability, by a safe method suitable for industrial production of pharmaceuticals. The invention relates to a method for producing Compound (5) and Radiolabeled Compound (6) as follows: wherein each symbol is as defined in the description.

Abstract: A solids-liquid separator comprises a basin in which liquid containing solids is introduced from an inlet port of the basin in a direction tangential to the side wall of the basin so as to produce a swirling flow of the liquid. The swirling flow also generates a secondary flow, and both flows promote the floating of floatable solids on the surface and the settling of settlable solids on the bottom. The solids floating on the surface are discharged by the overflowing liquid and the settled solids are discharged through a discharge pipe opening at the bottom of the basin. The liquid from which solids are separated is discharged outwardly from an outflow opening of the basin independent from the discharge of solids. The inlet port and outflow opening are separated circumferentially with respect to the flowing direction so that the circumferential separation thereof subtends at least 180 degrees about the center of the basin.

Abstract: A method for mounting a ring-shaped construction on a ship stern in front of a propeller which comprises fixing a plurality of pieces at a predetermined distance along a periphery of a ring-shaped construction, marking the points respectively on a plurality of said pieces which are located in a same distance from the center of said ring-shaped construction, and mounting said ring-shaped construction to said ship stern. In this process, centering so that the circular locus of the beam emitted from a projector being rotated around the rotating axis of a propeller passes over said marked points of a plurality of pieces fixed to said ring-shaped construction, the settling position of said ring-shaped construction is adjusted.