caa a22 4500 465730906 CHVBK 20180323111741.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF02039505 doi (NATIONALLICENCE)springer-10.1007/BF02039505 A simple preparation of calibration curve standards of134Cs and137Cs by serial dilution of a standard reference material [Elektronische Daten] [J. Labrecque, P. Rosales] Two sets of calibration standards for134Cs and137Cs were prepared by small serial dilution of a natural matrix standard reference material, IAEA-154 whey powder. The first set was intended to screen imported milk powders which were suspected to be contaminated with134Cs and137Cs. Therefore the concentration range of the calibration standards were about 40-400 Bq/kg. The precision of the preparation of the standard with about 7 Bq/kg of134Cs and 39 Bq/kg of137Cs at measurement time was 7.4% and 3.2%, respectively. The preparation of a similar standard by spiking the matrix with radioisotope solutions resulted in a poorer precision, about double that of the former technique. The other set of calibration standards was prepared to measure the environmental levels of137Cs in commercial Venezuelan milk powders. Their concentration ranged from 3-10 Bq/kg of137Cs. The accuracy of these calibration curves was checked by using IAEA-152 and A-14 milk powders. Their measured values were in good agreement with their certified values. Finally, it is shown that these preparation techniques by serial dilution of a standard reference material were simple, rapid, precise, accurate and cost-effective. Akadémiai Kiadó, 1990 Labrecque J. Instituto Venezolano de Investigaciones Científicas-IVIC, Apartado 21827, 1020A, Caracas, (Venezuela) aut Rosales P. Instituto Venezolano de Investigaciones Científicas-IVIC, Apartado 21827, 1020A, Caracas, (Venezuela) aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 140/2(1990-06-01), 331-340 0236-5731 140:2<331 1990 140 10967 https://doi.org/10.1007/BF02039505 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02039505 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Labrecque J. Instituto Venezolano de Investigaciones Científicas-IVIC, Apartado 21827, 1020A, Caracas, (Venezuela) aut NATIONALLICENCE 700 1- Rosales P. Instituto Venezolano de Investigaciones Científicas-IVIC, Apartado 21827, 1020A, Caracas, (Venezuela) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 140/2(1990-06-01), 331-340 0236-5731 140:2<331 1990 140 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer