⁹⁰Sr in 10-20 L via ⁹⁰Y beta measurements

This method describes the radiochemistry of seawater to analyze ⁹⁰Sr through the detection of its daughter ⁹⁰Y using beta counting. 20 L of seawater sample are pre-concentrated with iron hydroxide precipitates. This method needs to be done relatively quickly not to let ⁹⁰Y (T1/2=64 hours) decay once it is separated from ⁹⁰Sr. Chemical recovery is monitored with stable Y throughout the process.