This document describes the principles for the measurement of the activity of ⁹⁰Sr in equilibrium with ⁹⁰Y and ⁸⁹Sr, pure beta emitting radionuclides, in soil samples. Different chemical separation methods are presented to produce strontium and yttrium sources, the activity of which is determined using proportional counters (PC) or liquid scintillation counters (LSC). ⁹⁰Sr can be obtained from the test samples when the equilibrium between ⁹⁰Sr and ⁹⁰Y is reached or through direct ⁹⁰Y measurement. The selection of the measuring method depends on the origin of the contamination, the characteristics of the soil to be analysed, the required accuracy of measurement and the resources of the available laboratories.

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