PROCESS FOR THE PREPARATION OF STARTING RAW MATERIAL BASED ON SODIUM OR CESIUM IODIDE FOR THE GROWTH OF MONOCRYSTALS ON THEIR BASE

摘要

The invention relates to the preparation of starting salts of sodium or cesium iodide for the growth of monocrystals on their base. A process for the preparation of the initial raw material based on sodium or cesium iodide for the growth of monocrystals on their base, comprising loading of the initial salt to the ampoule, its vacuuming, and after that the heating of salt by the constant vacuuming to temperature 420-450 °, the introduction to the ampoule with the initial salt of dry air with the further holding, ampoule vacuuming, the second pumping of the dry air, holding at temperature 420-450 ° and the second vacuuming. After the second vacuuming the pumping of carbon dioxide to the ampoule to the pressure of 200- of mercury, keeping the salt in the atmosphere of carbon dioxide for 15-20 minutes and the ampoule vacuuming are carried out. The use of the invention allows obtaining iodides of alkali metals, which do not contain hydroxyl groups, providing high scintillation characteristics and photochemical stability of monocrystals.