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A reference source with the granular active portion was made using  152,154 Eu(III) loaded tin tungstate material. Batch equilibration method was used to investigate the interaction of  152,154 Eu(III) radiotracer (10 −4  M) in acid solutions on tin(IV) tungstate gel matrix. The sorption behavior of  152,154 Eu(III) showed high affinity towards tin(IV) tungstate gel matrix at low pH values. Tin tungstate gel matrix was loaded with  152,154 Eu 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  152 Eu and possible interference between γ lines of  152 Eu and  154 Eu. The relation between the grain size and the activity of samples was studied. Correction factor for capsule attenuation was applied.

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