[Biochemistry of metallocenes. III. Thymus-affinity for (103Ru)-ruthenocenyl-3-phenyl-propen-1-one]

103Ru labelled 1-Ruthenocenyl-3-phenyl-propen-1-one was administered to mice introperitoneally. The organ distribution was determined in liver, spleen, lung, muscle, blood, kidney and thymus. The highest concentration was found in the thymus-up to 22% of the injected dose/g with corresponding thymus to muscle ratios of up to 364:1. The consequences for nuclear medicine are discussed.