Development of Online Dilution System for Quantification of ⁹⁰Sr Using Automatic Solid-phase Extraction Inductively...

In this paper, we propose an online dilution system for the rapid quantification of radioactive strontium-90 (⁹⁰Sr) with inductively coupled plasma mass spectrometry coupled solid-phase extraction and O₂ dynamic reaction (cascade ICP-MS). The proposed system automatically provides a higher dilution ratio, which is at most 3.3 ± 0.2-times the ratio obtained by the previous method, without increasing the analysis time (<15 min). A detection limit of 2.7 Bq/kg wet (0.54 pg/kg wet) was achieved. The recovery test results were consistent with two different spiked values.