Mass-spectrometer MTI-350G

Mass-spectrometer MTI-350G is intended for carrying-out the automatic analysis of uranium isotopes content in gas phase and for control over the isotopic composition of uranium hexafluoride. Instrument application area includes control over the process lines of the separation production in industrial and laboratory conditions. The instrument can be used in the incoming inspection of the nuclear fuel cycle enterprises.

Technical solutions underlying the MTI-350G, design serve as a basis for creation of a model range of mass-spectrometers of different purpose.

Used in the mass-spectrometer is a number of original assemblies and systems which serve to obtain high analytical characteristics of the instrument:

ion-optical system with high dispersion;
ion source with molecular mode of sample leakage into the ionization chamber;
ion multi-collector with adjusted position of collectors;
puffing system with decreased consumption of sampling substance;
electronic part executed with application of the modern hardware components;
controller computer on the basis of the advanced reliability industrial computer;
specialized software performing control over the instrument and automatic measurement of isotopic composition.

Mass-spectrometer is assembled in the form of four stands: analytical stand, electronic stand, puffing stand, operator’s workstation

The instrument is registered in the State Register of Measuring Instruments, No. 23457-02. Certificate RU.C.31.005.A No. 13014.

Technical Characteristics:

Value of the accelerating voltage – 8 kV
Upper value of mass range with accelerating voltage of 8 kV – not less than 360
Resolving capacity measured at a level of 10% of uranium mass spectrum peaks intensity less width of the flat part of the peaks top – not less than 750
Peak top out-of-flatness – less than 0.02%
Threshold of uranium sensitivity – not more than 1x10^-5 (10ppm)
Sample consumption shall not exceed 1 mg/h
Isotopic threshold of sensitivity – not more than 1х10^-5 (10 ppm);
Memory factor – not more than 1005;
Relative standard deviation of a single measurement of uranium hexafluoride isotopic composition (with confidence probability of 0.95 on 20 measurements) – not more:

±0.02% for 235U content within the range of 1 to 5%;

±1,0% ±1.0% for 234U, 236U content within the range of 0.005 to 0.05%;

The facility is equipped with a protection system against voltage fluctuation and blackout in the supply mainsdiv>
The facility power supply is carried out from three-phase AC network, voltage – 380/220 ^+10%_-15%; V, frequency - 50± 0.5Hz
Maximum consumed power – not more than 3 kVA
Residual vacuum in the analyzer chamber – 5х10^-8 mm Hg or better
Weight of the analytical rack does not exceed 900 kg, puffing rack – 150 kg, electronic rack – 350 kg, operator’s workstation – 200 kg
Area occupied by the mass-spectrometer does not exceed 10m²
Mode of operation – continuous, round-the-clock
Service life – not less than 10 years