A rapid method for analysis of non-equilibrated 90 Sr/ 90 Y in infant formula

• Published in: Journal of radioanalytical and nuclear chemistry Vol. 330; p. 979
• Main Authors: Garnick, Kelly, Wetherby, Jr, Anthony E, Sweeney, Brian, Scott, Thomas A, Wei, Cong
• Format: Journal Article
• Language: English
• Published: Netherlands 29-10-2021
• Subjects: Ingrowth correction; Rapid analysis; Secular equilibrium; 90Sr/90Y; Radiostrontium
• ISSN: 0236-5731

A rapid analytical method for quantifying
Sr in infant formula prior to secular equilibrium is presented. The approach is dependent on the use of two separations of
Sr from
Y, with the first providing an
Y ingrowth start point and the second providing an
Y ingrowth end point. Data were obtained at activity concentrations of approximately 6 Bq/kg and 160 Bq/kg, the latter of which is representative of the US Food and Drug Administration (FDA) Derived Intervention Levels (DIL). Experiments were designed to collect data from ingrowth periods ranging from 16 h to 2 weeks. Activities obtained with a separation interval as low as 16 h ranged from 92.7 to 109.4% of the known value. When
Y ingrowth was allowed to occur for 24 h or longer, the activities ranged from 93.2 to 106.2% of the known value and the precision of this group improved from 5.2 to 3.1%. The limit of quantification (LOQ) was 0.5 Bq/kg using 250 g sample portions.