ASTM D4922 - 09

    Standard Test Method for Determination of Radioactive Iron in Water

    Active Standard ASTM D4922 | Developed by Subcommittee: D19.04

    Book of Standards Volume: 11.02


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    Significance and Use

    Radioactive iron is produced by neutron activation of stable iron. Its concentration in reactor coolant is used to monitor the corrosion of reactor parts such as reactor fuel-cladding material and reactor structural components.

    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 FePO4 at a pH of 3.0.

    1. Scope

    1.1 This test method covers the determination of 55Fe in the presence of 59Fe by liquid scintillation counting. The a-priori minimum detectable concentration for this test method is 7.4 Bq/L.

    1.2 This test method was developed principally for the quantitative determination of 55Fe. However, after proper calibration of the liquid scintillation counter with reference standards of each nuclide, 59Fe may also be quantified.

    1.3 This test method was used successfully with Type III reagent water conforming to Specification D 1193. 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 and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see Section 9.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1068 Test Methods for Iron in Water

    D1129 Terminology Relating to Water

    D1193 Specification for Reagent Water

    D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water

    D3370 Practices for Sampling Water from Closed Conduits

    D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis

    D7282 Practice for Set-up, Calibration, and Quality Control of Instruments Used for Radioactivity Measurements


    ICS Code

    ICS Number Code 13.060.50 (Examination of water for chemical substances); 13.060.60 (Examination of water for physical properties)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard

    DOI: 10.1520/D4922-09

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D4922-09, Standard Test Method for Determination of Radioactive Iron in Water, ASTM International, West Conshohocken, PA, 2009, www.astm.org

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