Sorbational Concentration And The Following Radio- Analytical Definition Of Micro-quantities
Sorbational concentration and the following radio- analytical definition of micro-quantities
of the newly formed radio nuclides
H. Vasylyeva1, V. Strelko1, A. Osypenko2
1ISPE National Academy of Sciences of Ukraine,
Henerala Naumova st. 13, Kyiv, Ukraine
tel: (044) 452-93-28, fax: 452-93-27
2Department of Nuclear Physics, Uzghorod National University,
Pidhirna st. 46, Uzghorod, Ukraine
tel: (03122) 2-97-24
The possibility of concentration of the nuclide 128 I was investigated by various types of coal using chemical methods and the method of the activation analysis.
The optimum conditions of sorption (a temperature, pH of solution) were defined by chemical methods. SKS, SKS(activate) coals as well as two types of lignosulphonate (LS) coal from Arhanhelsk (ordinary and oxidizing coal), were used as sorbent.
The researches have shown that, in general, the increasing of temperature decreases the coefficient of sorption, but pH, except of the interval (pH = 0.5 – 2), influences the process comparatively little. A possibility of sorptional concentration was investigated by the method of the activation analysis. Crystalline iodine was activated by slow neutrons from the reaction 9Be (g, n) on microtrone M-10. As a result 128 I* was formed (T½ = 25 min), which dissociates according to the following scheme:
n + 127 І 128 І*
6% 94%
(Т1/2 = 1.5 1024 years) Te Xe – stable isotope
The example radiated β-parts with the energy E= 2.12 Mev (76 %) and E=1.665 Mev (15.5 %), as well as g-quantum with the energy E = 0.443 Mev.
Residuum concentration of iodine after its reaction with sorbent was measured according to the intensity of β-spectra of solution with the help of scintillator β-spectrometer with plastic scintillator with the following sizes L = 1 sm and d = 6 sm. A concentrated ability of sorbent was evaluated according to the decrease of β-activity of solution.
The results received by this method showed that SKS(activate) is most suitable for the removal of short live 128 I out of water solution KI.
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