Attenuation of I- 125 radiation by chloroform and other dense solvents, and its relevance to radioimmunoassays: concise communication.


The counting efficiency of iodine- 125 in well-type scintillation counters is reduced when the labeled compound is dissolved or suspended in chlorinated hydrocarbons or potassium iodide solution. The reduction is probably caused by absorption of the weak gamma and x-rays of I- 125 by the halogen atoms in the solvent or solute molecules. This phenomenon may… (More)