A method for routine preparation of very pure chlormerodrin labelled with 197Hg or 203Hg with high specific activity

Abstract A method for routine production of 3‐chloromercuri‐2‐methoxy‐propylurea‐ 197 Hg or 203 Hg with a high specific activity and high radiochemical purity, has been elaborated. Important for the method are: good and standardized HgCl 2 , the maintenance of molar ratioe HgCl 2 to sodium acetate and allylurea 1:1 and 1:5 respectively, and the time of heating of the reaction mixture in the autoclave with overpressure 0.2 ‐ 0.3 At, not less than 6 hrs. The use of anhydrous ethyl ether for washing the precipitate removes both organic and inorganic radiochemical impurities. The method enables one to work with quantities of HgCl 2 lower than 1 mg.