Radium isotopes in seawater using MnO2 acrylic fiber

This method specifies the minimum requirements and laboratory methods for measuring ²²⁶Ra in seawater samples using alpha-spectrometry via its daughter ²²²Rn, and ²²⁸Ra using beta- counter via its daughter ²²⁸Ac.

Samples are concentrated by MnO₂-fibers with flow rate less than 0.5 L/min. Then the MnO₂– fibers are sealed in valve bag and stored for the determination of ²²⁶Ra. After the analysis of ²²⁶Ra, Ra isotopes on MnO2-fibers are eluted by 2 M HCl solution and co-precipitated for the determination of ²²⁸Ra.