FIELD: measurement technology. SUBSTANCE: proposed method is aimed at provision for biological safety. Realization of the method makes it possible to avoid use of artificial radionuclides. In compliance with the method detector registers gamma radiation generated with natural radioactive nuclides naturally distributed in medium surrounding vessel under check. Positional check of level is conducted by comparison of characteristics dependent on position of level of registered gamma radiation with preset threshold value. EFFECT: improved reliability of method. 2 dwg
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