Determination of ²²⁸Ra and ²²⁶Ra in Seawater Collected on Manganese-Impregnated Acrylic Fiber

Abstract

Determination procedure for concentration of ²²⁶Ra and ²²⁸Ra in seawaters was developed. The ²²⁶Ra in seawaters was collected in-situ on Mn-impregnated acrylic fiber which was packed into a plastic column and was determined by y-ray spectrometry in the laboratory. Concentration of ²²⁸Ra which is low in seawaters was obtained by the ²²⁶Ra concentration and the ²²⁸Ra/²²⁶Ra activity ratio observed simultaneously with the Mn-impregnated acrylic fiber by placing in the seawater for a few days at the identical sampling point for ²²⁶Ra.