METHOD FOR CONTROLLING URANIUM-235 MASS FRACTION IN GASEOUS URANIUM HEXAFLUORIDE AND CONTROL SYSTEM

摘要

The invention relates to nuclear material analysis by radiation methods and can be used for on-line monitoring uranium hexafluoride enrichment in isotopic dividing production. The gamma-radiation intensity, the temperature and pressure are determined by means of said averaged measurement results within identical time intervals when a current time is changed at a value equal to the time segment of the time interval. The calculated value of the uranium-235 mass fraction is referred to the current time related to said measuring time interval. The inventive controll system comprises a measuring chamber (11) which is provided with a detecting unit (6), temperature (7) and pressure (8) sensors and connected to an uranium hexafluoride gas manifold (4), a controller (11) provided with electric pulse counters (15-17) and a gamma-spectrum analyser (18), signal adapters (9, 10), an internal data bus (20) and a data collecting, controlling and processing unit (21). Said controller comprises at least three discriminators (12-14) and one timer (19). The inputs of said discriminators are connected to the output of an individual electric pulse counter, the output of each discriminator is connected to the input of said individual electric pulse counter which is connected to the second output of the timer. The outputs of the timer and adapters are connected to the internal data bus (20) by means of a data exchange line. The data collecting, controlling and processing unit is connected to a control computer network (23) through an external interface network (22).