Thermoluminescence dating of deposits is performed in the Soviet Union in three laboratories using widely differing techniques. In the Institute of Geology of the Academy of Sciences of the Ukrainian SSR, investigators work with a polymineral fraction of 10-100 mum. The dating interval they cover is 2 x 10₄ 10₆ years. In Moscow State University the scientists use the quartz fraction with a grain size up to 250 mum without etching in hydrofluoric acid. They are able to date deposits in the time interval 4 x 10₃ 9.5 x 10₆ years. In the Institute of Geology of the Academy of Sciences of the Estonian SSR, the quartz and feldspar inclusion technique is used. Quartz enables the dating of deposits up to 10₅ years in age. With feldspars the age limit is 7 x 10₅ years. See also 20-32. -- AATA