RESUMO
A method for the determination of (99)Tc (T1/2: 2.1 × 10(5)a) in milk and dairy products is presented in detail. The method includes the separation of fat and proteins from milk, the separation of Tc by anion exchange from other metals and the purification of Tc by extraction chromatography with subsequent measurement using LSC. A recommendation is given on how to use rhenium as a carrier for this particular matrix. The full analysis is done in 24h. The detection limit for milk is 0.2 Bq/l.
Assuntos
Fracionamento Químico/métodos , Laticínios/análise , Análise de Alimentos/métodos , Contaminação Radioativa de Alimentos/análise , Leite/química , Radiometria/métodos , Tecnécio/análise , Animais , Liberação Nociva de Radioativos , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Manejo de Espécimes/métodosRESUMO
In emergency situation or in case of defence against nuclear hazards, the rapid analysis of radioisotopes in food products is essential. Radiostrontium is one of the most interesting isotopes in case of emergency. The determination of radiostrontium in milk and dairy products plays an important role especially for infants. The procedures described here were tested for fast determination of (90)Sr. The typical chemical recovery of the proposed fast procedure for determination of strontium from milk and dairy products was 90% and the time needed for analysis was one working day. The achieved detection limit for milk is 0.8Bq/l. An ultra fast screening method allows the determination of radiostrontium with quantitative recovery within 1 hour. The minimum detectable activity in this case is 230Bq/l.
