Standard Practice for Concentration of Select Radionuclides Using MnO2 for Measurement Purposes

Importancia y uso:

5.1 This practice is applicable to the separation of specific radionuclides of interest as part of overall radiochemical analytical methods. Radionuclides of interest may need to be quantified at activity levels of less than 1 Bq. This may require measurement of less than 1 fg of analyte in a sample which has a mass of a gram to more than several kilograms. This requires concentration of radionuclides into a smaller volume counting geometry or exclusion of species which would impede subsequent chemical separations, or both. MnO₂ has shown good selectivity in being able to concentrate the following elements: actinium (Ac), bismuth (Bi), lead (Pb), polonium (Po), plutonium (Pu), radium (Ra), thorium (Th), and uranium (U) as noted in the referenced literature (see Sections 4 and 8). The MnO₂ can be loaded onto a variety of substrates in preparation for use or generated in-situ in an aqueous solution. The presented processes are not meant to be all encompassing of what is possible or meant to address all limitations of using MnO₂. Some limitations are noted in Section 6, Interferences.

Subcomité:

D19.04

Volúmen:

11.02

Número ICS:

17.240 (Radiation measurements)

Palabras clave:

chemical separation; concentration; hydrous manganese oxide; manganese oxide; pre-concentration;