A method for cleaning crystal material and for the production of crystals, an apparatus therefor and to the use of the crystals thus obtained

There is described a method for producing crystals with low absorption performance, low diffuse scattering and radiation damage by purification of crystal raw material in a device (100) comprising a sealable crucible (122) for melting the crystal raw material, wherein the sealable crucible (122) at least having an opening (142). The method includes drying of the raw material by removing by absorption, adsorption and / or chemically bound water, a reaction of the obtained in the raw material impurities with at least one scavenger and a homogenization of the molten crystal material and is characterized in that the opening (142) defined has geometrical conductances, wherein the drying is at a temperature of 100 ° C to 600 ° C over a period of at least 20 hours at a geometric conductance of the opening 2.00 to 30.00 mm Drying, reacting with the impurities scavenger, homogenizing with an equal opening ...