Abstract: A method of producing a purified tin, which emits low alpha radiation by using a vacuum refining has developed: the steps are comprising: preparing a crude tin; containing the crude tin in a crucible and placing it in a vacuum furnace; and removing the impurities, which have higher vapor pressures and low boiling points than that of the tin from the vacuum furnace. The impurities, such as a lead and bismuth can be removed as much as possible by utilizing the difference of the vapor pressure of the elements in the tin. It is possible to minimize the emission of alpha radiation, so that it can be prevented the occurrence of the software errors.