1.1 本试验方法包括测定 55 铁存在时 59 液体闪烁计数法。这个 先验 本试验方法的最低检测浓度为7.4 Bq/L。 2. 1.2 本试验方法主要用于定量测定 55 Fe。然而，在使用每种核素的参考标准对液体闪烁计数器进行适当校准后， 59 铁也可以量化。 1.3 本试验方法已成功用于符合规范的III型试剂水 D1193 . 用户有责任确保本试验方法对未经试验基质的水的有效性。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体的危险说明，请参阅第节 9 . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 Fe-55是在核反应堆的反应堆冷却剂系统中通过稳定铁的活化而形成的。这个 55 废物处理系统不能完全去除铁，一些铁通过正常废液排放释放到环境中。 发电厂需要监测这些排放物 55 铁以及其他放射性核素。 5.2 该技术通过添加滞留载体和阴离子交换技术，有效去除其他活化和裂变产物，如碘、锌、锰、钴和铯的同位素。裂变产物（锆-95和铌-95）用盐酸-氢氟酸洗涤液选择性洗脱。铁最终从锌中分离出来 +2 通过FePO的沉淀 4. pH值为3.0时。

1.1 This test method covers the determination of 55 Fe in the presence of 59 Fe by liquid scintillation counting. The a-priori minimum detectable concentration for this test method is 7.4 Bq/L. 2 1.2 This test method was developed principally for the quantitative determination of 55 Fe. However, after proper calibration of the liquid scintillation counter with reference standards of each nuclide, 59 Fe may also be quantified. 1.3 This test method was used successfully with Type III reagent water conforming to Specification D1193 . It is the responsibility of the user to ensure the validity of this test method for waters of untested matrices. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see Section 9 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Fe-55 is formed in reactor coolant systems of nuclear reactors by activation of stable iron. The 55 Fe is not completely removed by waste processing systems and some is released to the environment by means of normal waste liquid discharges. Power plants are required to monitor these discharges for 55 Fe as well as other radionuclides. 5.2 This technique effectively removes other activation and fission products such as isotopes of iodine, zinc, manganese, cobalt, and cesium by the addition of hold-back carriers and an anion exchange technique. The fission products (zirconium-95 and niobium-95) are selectively eluted with hydrochloric-hydrofluoric acid washes. The iron is finally separated from Zn +2 by precipitation of FePO 4 at a pH of 3.0.