ISO 23655-1:2022

Water quality — Nickel-59 and nickel-63 — Part 1: Test method using liquid scintillation counting

This document specifies the determination of nickel-59 and nickel-63 (⁵⁹Ni and ⁶³Ni) activity concentration in samples of all types of water using liquid scintillation counting (LSC). Using currently available liquid scintillation counters, this test method can measure ⁵⁹Ni activity concentrations of 50?mBq·l^-1 and ⁶³Ni activity concentrations of 20?mBq·l^-1 with a counting time of 200?min and a sample volume of?1,5?l.

NOTE????? These performance indicators are wholly dependent on the measurement regimes in individual laboratories; in particular, the detection limits for ⁵⁹Ni are entirely dependent on the levels of ⁶³Ni that can be present.

The range of application depends on the amount of dissolved material in the water and on the performance characteristics of the measurement equipment (background count rate and detection efficiency).

It is the laboratory’s responsibility to ensure the suitability of this test method for the water samples tested.

Edition	2022
Standard Part No	1
Published Date	2022
Published By	International Standardization Organisation
Page Count	21