[en] KAERI has obtained an advanced technology with singular originality for laser stable isotope separation. Objectives for this project are to get production technology of Tl-203 stable isotope used for medical application and are to establish the foundation of the pilot system, while we are taking aim at 'Laser Isotope Separation Technology to make resistance to the nuclear proliferation'. And we will contribute to ensuring a nuclear transparency in the world society by taking part in a practical group of NSG and being collaboration with various international groups related to stable isotope separation technology

[en] The admixture of core excitations to the low lying states of A = 203 and A = 205 thallium isotopes has been calculated. The wave functions obtained reproduce the electromagnetic properties as well as the hyperfine splittings and the isomershifts of both thallium isotopes. (orig.)

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[en] We propose a technique for testing the validity of the Pauli exclusion principle for electrons which is capable of improving the sensitivity by many orders of magnitude (by ²⁰⁵Tl (neutrino, electron) ²⁰⁵Pb inverse beta-decay)

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[en] The photoelectric non-standard method for determination of the thallium isotope composition is developed. The analysis is carried out by measuring the brightness of the Hfs components in the line Tl Iλ535.04 nm. The relative standard deviation of the results of the isotope analysis of thallium as metal is 0.02 and of thallium salts - 0.02-0.05

[en] Using atomic-beam spectroscopy, we measured hyperfine splitting constants and level isotope shifts of n ²S_1/2 levels (n=7,8) in ²⁰³Tl and ²⁰⁵Tl with a frequency doubled cw-dye-laser. Our results are: A(7²S_1/2)=12242.6 (1.6) MHz and A(8²S_1/2)=3855.7 (3.2) MHz for hyperfine-structure (HFS) constants in ²⁰³Tl and A(7²S_1/2)=12350.9 (3.9) MHz and A(8 ²S_1/2)=3888.4 (4.3) MHz for HFS constants in ²⁰⁵Tl; Δν_IS(7²S_1/2)=+409.8 (3.6) MHz and Δν_IS(8²S_1/2)=+136.0 (4.1) MHz for level isotope shifts (IS). (orig.)

[en] Separation of thallium isotopes (203TI, 205TI) have been carried out by a 180 electromagnetic isotope separation. Thallium iodide as the charge material is used in a graphite crucible of calutron ion source. Under the pressure of 1x10₅ torr, thallium ions are extracted, accelerated and focused by the electrical lenses. The ions then traverse the main vacuum tank in circular paths, entering the magnetic field of 2547 gauss and finally reach the collector. A number of chemical of procedures have been employed for recovery and purification of the collected ions from the copper pockets. The final isotopic products have been characterized by a x-ray diffractometer, inductively coupled plasma-atomic emission spectrometer (ICP-AES) and a mass spectrometer. High pure thallium trioxide (TI-20-3) with 95.91% isotopic abundance for 203 TI has been confirmed