Song Lijuan, Yang Yonggang, Luo Maoyi, Ma Yan, Dai Xiongxin
China Institute for Radiation Protection, Taiyuan, China.
China Institute for Radiation Protection, Taiyuan, China; Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou, China.
J Environ Radioact. 2017 May;171:169-175. doi: 10.1016/j.jenvrad.2017.01.024. Epub 2017 Mar 8.
A new radiochemical separation method has been developed for rapid determination of alpha-emitting radium isotopes in seawater samples. This method can be applied for the measurement of Ra in seawater samples when Ra is used as tracer for chemical recovery correction. Likewise, Ra can also be added as tracer for the determination of Ra in seawater sample. In the method, radium is first pre-concentrated with hydrous titanium oxide (HTiO) and is purified by combined anion/cation exchange column chromatographic separation. The radium in the eluate is then co-precipitated with HTiO, dissolved in 9 M HSO, and followed through a BaSO micro-precipitation step to prepare a thin-layer counting source to determine the activities of Ra/Ra by alpha spectrometry. Replicate spike and blank samples were measured to evaluate the performance of the procedure. The minimum detectable activity concentration was determined to be 0.5 mBq·L for Ra and 0.4 mBq·L for Ra in 1 L of seawater sample with a counting time of 48 h. The method is a promising candidate for rapid measurement for alpha-emitting Ra isotopes in a large population of environment water samples.
已开发出一种新的放射化学分离方法，用于快速测定海水样品中发射α粒子的镭同位素。当镭用作化学回收率校正的示踪剂时，该方法可用于测量海水样品中的镭。同样，也可以添加镭作为示踪剂来测定海水样品中的镭。在该方法中，镭首先用氢氧化钛（HTiO）进行预浓缩，然后通过阴离子/阳离子交换柱色谱联合分离进行纯化。然后将洗脱液中的镭与HTiO共沉淀，溶解在9M HSO中，并经过硫酸钡微沉淀步骤，制备薄层计数源，通过α能谱法测定镭/镭的活度。对重复加标样品和空白样品进行测量，以评估该程序的性能。在计数时间为48小时的情况下，1升海水样品中镭的最低可检测活度浓度确定为0.5 mBq·L，镭为0.4 mBq·L。该方法有望用于大量环境水样中发射α粒子的镭同位素的快速测量。
