abstract:A graduation tower is a structure used in the production of salt which removes water from a saline solution by evaporation, increasing its concentration of mineral salts. The tower consists of a wooden wall-like frame stuffed with bundles of brushwood (typically blackthorn) which have to be changed about every 5 to 10 years as they become encrusted with mineral deposits over time.
The installationoflevel gauge used for ureastrippingtower, thestructure and forming of radioactiverodsource, and the calculation of its approximatelineargraduation are described.