A rapid determination method of ⁹⁰Sr is developed for the monitoring of seawater around the Fukushima Daiichi Nuclear Power Plant (FDNPP). Three ideas of chemical separation and measurements to accelerate ⁹⁰Sr analysis are investigated. Strontium is co-precipitated in a two-step procedure with hydroxyapatite after the removal of magnesium phosphate in the presence of citric acid. The purification process of strontium is in combination with solid phase extraction disks. One or two sheets of Sr Rad disk and cyclic operations are examined to eliminate interfering substances and secure the exchange capacity. The suitable conditions of adsorption and stripping are determined with a ⁸⁵Sr tracer. Seawater samples up to 1 L can be analyzed within 4 h. Additionally, the appropriate pH conditions to extract strontium to the scintillator are studied, and the ⁹⁰Sr activity is assessed via liquid scintillation counting using an extractive scintillator based on the di-(2-etyl hexyl)-phosphoric acid (HDEHP) extraction method. The new scintillation counting method involves a small quenching effect and a low background compared to the conventional emulsion scintillator method. The minimum detectable activity (MDA) is 35 mBq/L of ⁹⁰Sr in 180 min of counting. The proposed method provides analytical results within a day after receipt of the samples.

开发了一种⁹⁰ Sr的快速测定方法，用于监测福岛第一核电站（FDNPP）周围的海水。研究了化学分离和测量以加速⁹⁰ Sr分析的三种思路。在柠檬酸存在下去除磷酸镁后，锶与羟基磷灰石分两步共沉淀。锶的纯化过程与固相萃取盘结合使用。检查了一张或两张Sr Rad盘和循环操作，以消除干扰物质并确保交换容量。用⁸⁵确定合适的吸附和汽提条件Sr示踪剂。可以在4小时内分析高达1 L的海水样品。此外，研究了将锶提取到闪烁器中的合适pH条件，并使用了基于二-（2-乙基己基）-磷酸（HDEHP）提取方法的萃取闪烁器，通过液体闪烁计数来评估⁹⁰ Sr活性。与常规乳液闪烁器方法相比，新的闪烁计数方法具有较小的猝灭效果和较低的背景。最小可检测的活性（MDA）是35个MBQ / L ⁹⁰在计数180分钟锶。所提出的方法在收到样品后的一天之内提供分析结果。