Scientific, Engineering and Metrological Problems in Producing Pure ²⁸Si and Growing Single Crystals

Abstract

The centrifugation method has advantages in producing silicon isotopes. The selection of appropriate working gas, development of gas centrifuges, their arrangement for effective separation of the isotopes and optimization of the production process are considered. The resulting mole fraction of 28Si is better than 0,999 9. The requirements for the production processes in growing single crystals and the related problems are analysed in detail and estimates of the uncertainties associated with the necessary tests are given.