Development of granular radioactive reference source from 152,154Eu adsorbed on tin tungstate matrix.

A reference source with the granular active portion was made using ^152,154Eu(III) loaded tin tungstate material. Batch equilibration method was used to investigate the interaction of ^152,154Eu(III) radiotracer (10⁻⁴ M) in acid solutions on tin(IV) tungstate gel matrix. The sorption behavior of ^152,154Eu(III) showed high affinity towards tin(IV) tungstate gel matrix at low pH values. Tin tungstate gel matrix was loaded with ^152,154Eu from batch at pH 3. Standardization of the source was done spectroscopically with reference to primary certified set of radioactive sources and with the aid of HPGe detector. Random and true coincidence summing was carried out by following-up coincidence in ¹⁵²Eu and possible interference between γ lines of ¹⁵²Eu and ¹⁵⁴Eu. The relation between the grain size and the activity of samples was studied. Correction factor for capsule attenuation was applied. [ABSTRACT FROM AUTHOR]