Fig.1-22　SEM image of SSA (a), elemental composition of SSA on oxide basis (b), and elemental composition of residue after SSA was pulverized and treated with a hydrochloric acid aqueous solution (c)

Fig.1-22 SEM image of SSA (a), elemental composition of SSA on oxide basis (b), and elemental composition of residue after SSA was pulverized and treated with a hydrochloric acid aqueous solution (c)

Iron is contained in aggregates of numerous fine particles (the left particle shown with a yellow arrow in (a)). By dissolving all of the iron, the radioactivity concentration of ¹³⁷Cs in SSA, 23000 Bq/kg, was decreased to 4800 Bq/kg.

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