Standard Test Method for Determination of Radioactive Iron in Water

Importancia y uso:

5.1 Fe-55 is formed in reactor coolant systems of nuclear reactors by activation of stable iron. The ⁵⁵Fe 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 ⁵⁵Fe 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 FePO₄ at a pH of 3.0.

Subcomité:

D19.04

Volúmen:

11.02

Número ICS:

13.060.50 (Examination of water for chemical substances), 13.060.60 (Examination of water for physical properties)

Palabras clave:

anion exchange; ⁵⁵Fe; liquid scintillation counting; radioactive iron; radioactivity;