Effect of selective sorptive agents on leachability of (sup 137)Cs and (sup 90)Sr

摘要

Decades ago it was established that illite effectively improves (sup 137)Cs leach resistance. Subsequently, illite has become a standard ingredient used at Oak Ridge National Laboratory in grouts developed to stabilize (sup 137)Cs. Adding illite improves (sup 137)Cs leach resistance by three orders of magnitude, and increasing the illite concentration can add another order of magnitude improvement. Adding crystalline silicotitanate, a selective sorptive agent developed more recently for (sup 137)Cs, not only improves (sup 137)Cs leach resistance by an order-of-magnitude over that obtained using illite but also improves (sup 85)Sr leach resistance by two orders of magnitude.