Preparation of Spherical Potassium Cobalt Hexacyanofe Rate(Ⅱ) Inorganic Ion-exchanger Supported on Silica Gel for ¹³⁷Cs-^137mBa Radioisotope Generator

The mother-daughter relation and the different chemical properties between ¹³⁷Cs and ^137mBa makes it possible to prepare ¹³⁷Cs-^137mBa generator to obtain ^137mBa nuclides. The potassium cobalt hexacyanoferrate(Ⅱ) inorganic ion-exchanger supported on silica gel was prepared, its Cs⁺ static adsorption capacity was 0.311 mmol/g, and its adsorption equilibrium constant was 2.2×10⁴. The 1.85×10⁹ Bq (50 mCi) miniature generator was prepared, The elution efficiency was greater than 50%. The breakthrough of cesium was 10^-7 per milliliter of eluent. The service life was more than 1 year.