BISMUTH-212 RADIONUCLIDE OBTAINING METHOD Russian patent published in 2011 - IPC G21G1/08 

FIELD: power industry.

SUBSTANCE: solution containing mixture of radionuclides thorium-228 and thorium-229, as well as daughter decay products of these radionuclides is bubbled with gas, thus extracting from them one of daughter decay products of thorium-228 - gaseous radionuclide radon-220. Gas is supplied through aerosol filter to sorption device where as a result of radioactive decay as per chain ²²⁰Rn→²¹⁶Po→²¹²Pb there accumulated is radionuclide lead-212, which, after attainment of saturation of activity of lead-212, is desorbed. The obtained solution is supplied to column with ion-exchange resin from which the daughter decay product of radionuclide bismuth-212 is washed from time to time. As bubbling gas there used is air and/or nitrogen and/or helium and/or argon and/or krypton and/or xenon. As sorption device there used is hollow volume the dimensions of which provide the residence time of radon-220, which is sufficient for its complete decay to radionuclide lead-212, or trap with activated carbon.

EFFECT: reducing the labour intensity of the process and the content of doping radionuclides.

4 cl