95Zr-95Nb in Environment. II.:Adsorption Behavior of 95Zr-95Nb on Fishing-net from Sea Water

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Adsorption of 95Zr-95Nb on 13 fishing-net samples (4 different materials) from sea water was measured at various time in order to investigate the chemical behavior of 95Zr-95Nb and to obtain data for estimation of the external radiation dose from 95Zr-95Nb released into sea water and adsorbed on fishing-net. Percent adsorption (A) increased rapidly with time (t) and began to level off at about 10-25 hr. Relation between A and t is given by an equation A=k⋅tn, where k is a constant and n was found to be 0.20-0.71. The values of A varied in the range of 10-80% at 50 hr equilibration with thickness (denier, D) of the thread and with material of the samples, showing a relation A= k′⋅D-1/2, where k′is a material-dependent constant. Since D-1/2is proportional to the surface area of the sample of a unit weight, A is proportional to the surface area. As to the kind of material from which the sample was made, a sequence of A, nylon> "Kuremona" (polyvinyl alcohol fiber) >polyehtylene> "Lux" (polypropylene), was obtained.
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