To provide a radioactive diagnostic imaging agent comprising a radioactive halogen-labeled compound having higher stability as an active ingredient, by controlling radiolysis of the active ingredient.
A biologically acceptable saccharide or sugar alcohol is added to the radioactive diagnostic imaging agent in an amount effective for control of radiolysis. The amount of the saccharide or sugar alcohol to be added is preferably 10 (mmol/L)/GBq/mL or more, more preferably 50 (mmol/L)/GBq/mL or more. The saccharide is preferably selected from the group consisting of erythrose, threose, ribose, arabinose, xylose, lyxose, allose, altrose, glucose, mannose, gulose, idose, galactose, talose, erythrulose, ribulose, xylulose, psicose, fructose, sorbose and tagatose. The sugar alcohol is preferably selected from the group consisting of erythritol, xylitol, sorbitol and mannitol.
NAKATANI AKIRA
TAKAHASHI HIROYOSHI
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