Determination of 90Sr and milk by using two inorganic exchangers

Two inorganic exchangers, consisting of PRTD (partially reduced tin dioxide) and CUCR (normal copper chromate), both prepared and studied by the authors, were investigated for radiochemical isolation and purification of Sr-90 from milk samples. A procedure combining the use of both exchangers is reported and is recommended when it is necessary to remove a radiobarium interference. Due to the lack of appropriate samples the procedure was tested using defatted milk spiked with Sr-90 and Ba-133.