Abstract
Abstract Sealed sources of 183.15 ± 5% kBq (4.95 ± 5% μCi) 137 Cs and 38.48 ± 5% kBq (1.04 ± 5% μCi) 60 Co based on inorganic sorbents were easily prepared, standardized, and successfully passed quality control tests. 137 Cs ( t 1/2 = 30.07 y) radionuclides were sorbed by equilibration of 137 CsNO 3 solution with 6-tungstocerate(IV) inorganic ion-exchanger at pH 3 for 48 h at 25 ± 1 °C, whereas 60 Co ( t 1/2 = 5.27 y) radionuclides were retained by coprecipitation from 60 Co(NO 3 ) 2 solution with Al(OH) 3 at pH 9.5. Then, the matrices retaining 137 Cs and 60 Co were washed and dried to be ready for use as cores of the sealed sources of the corresponding radionuclides. A calibrated amount of each matrix was separately packed in a stainless steel capsule in the form of round disc. After radiometric standardization and encapsulation, the sealed sources were submitted to quality control tests and finally checked radiometrically before release to the local market for calibration purposes of radiation measurement and identification instruments.
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