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We present the radioanalytical strategies used for the determination of strontium radioisotopes in routine and emergency samples. While in routine monitoring, the main goal is to achieve limits of detection as low as possible. In emergency, priority is given to the rapid procurement of data about a contamination. The parameters accuracy, precision and detection limit of the radiochemical methods are shown. We present the results obtained over the past 22 years in proficiency tests and in the analysis of reference materials. • Determination of Sr radioisotopes in routine monitoring program. • Determination of Sr radioisotopes in nuclear or radiological emergency. • Validation of radiochemical methods. • Extension of validity period of certified reference materials. [ABSTRACT FROM AUTHOR]