THALLIUM ISOTOPES SEPARATION METHOD Russian patent published in 2008 - IPC B01D59/00 B01D59/34 B01D59/50 C01G15/00 

FIELD: processes of nuclear physics.

SUBSTANCE: method comprises steps of creating beam of thallium atoms, for example by heating metallic thallium in evaporation chamber till 600 - 660°C; providing equilibrium pressure of thallium vapor 1 - 10 Pa; simultaneously igniting gas discharge in order to realize first stage of thallium atoms excitement to meta-stable state due to creating beam of thallium atoms in excited meta-stable state; then realizing second stage of excitement by means of laser irradiation during two successive steps. At first stage thallium atoms in excited meta-stable state are excited by means of laser irradiation, for example with wave length 535 nm to resonance state. At second stage atoms of desired thallium isotope in excited resonance state are transferred to Rydberg state by means of laser irradiation, for example with wave length 444 nm. At both stages of excitement pulse mode of laser irradiation with pulse duration, for example 5 - 10 s is used. After multi-stage excitement atoms of desired isotope of thallium are ionized and extracted from beam due to applying cross electric field at supplying pulse voltage in mode limiting occurring of super-irradiation from levels corresponding to Rydberg state. Preferably, voltage value is in range 10 - 25 kV, pulse duration is in range 30 - 100 ns. The whole process is realized in vacuum whose level provides creation of processes necessary for separation of thallium isotopes.

EFFECT: lowered power consumption, improved quality parameters of laser beam.

19 cl, 3 dwg, 10 ex