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Immobilization and Leakage of Krypton Encapsulated in Zeolite or Glass

  • A. B. Christensen (a1), J. A. Del Debbio (a1), D. A. Knecht (a1) and J. E. Tanner (a1)

Abstract

Krypton and other gases are readily adsorbed in zeolite 5A molecular sieve or porous Vycor “thirsty glass” and may be trapped there by sintering 2–4 hours at 700° or 900°C, respectively. Encapsulation in these materials is the basis of a method to “immobilize” krypton-85 for storage. Amounts of gas trapped are approximately proportional to gas density, and are about 50 and 40 cc(standard conditions = STP)/cc of solid at 1000 atm, for zeolite 5A and glass, respectively. Based on tests of a few months duration a leakage of 0.3% of the krypton is predicted for 10 years at 400°C for either material.

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1. Federal Register 42, No. 9, Title 40, Part 190 (January 13, 1977).
2. Benedict, R.W., Christensen, A.B., Del Debbio, J.A., Keller, J.H. and Knecht, D.A., “Technical and Economic Feasibility of Zeolite Encapsulation for Krypton–85 Storage,” ENICO–1011 (September 1979).
3. Breck, D. W., J.Chem. Ed. 41, 678 (1964).
4. Penzhorn, R. D., Schuster, P., Noppel, H. E. and Helwig, L. M., “Long- Term Storage of Krypton-85 Zeolite” in Proceedings Int. Symp. Management of Gaseous Wastes from Nuclear Facilities, IAEA-SM–245, Vienna (February 1980).
5. Penzhorn, R. D., “Long-Term Storage of Kr–85 in Zeolite 5A,” in Proceedings of the 16th DOE Nuclear Air Cleaning Conference, CONF–801038, NTIS, pp. 10341046.
6. Tingey, G. L., Lytle, J. M., Gray, W. J. and Wheeler, K. R., “Solid State Storage of Radioactive Krypton in a Silica Matrix,” PNL–3617 (December 1980).
7. Breck, D. W., Zeolite Molecular Sieves, (John Wiley, 1974), p 84 and 428.
8. Crank, J., The Mathematics of Diffusion, 2nd ed., (Clarendon Press, Oxford 1975), Figures 5.10 p. 83 and 6.7 p. 99.

Immobilization and Leakage of Krypton Encapsulated in Zeolite or Glass

  • A. B. Christensen (a1), J. A. Del Debbio (a1), D. A. Knecht (a1) and J. E. Tanner (a1)

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