Patent Number: 
Section: claims

1. A radiation surrogate for weapons-grade plutonium, comprising in combination the radioisotopes: Ba-133 having an activity of between 5 and 5.5 μCi, Cf-252 having an activity of between about 4 and about 5 μCi, Cs-137 having an activity of between about 10.2 and about 10.4 μCi, Gd-153 having an activity of between about 350 and about 550 μCi, Lu-177m having an activity between about 40 and about 50 μCi, Sn-113 having an activity between about 13.5 and about 30 μCi, and Zr-95 having an activity between about 1 and about 6 μCi; wherein said combination of radioisotopes is substantially surrounded by tungsten foil. 2. The radiation surrogate of claim 1, wherein said radioisotopes in said combination of radioisotopes are individually sealed. 3. The radiation surrogate of claim 2, wherein said individually sealed radioisotopes in said combination of radioisotopes are disk-shaped. 4. The radiation surrogate of claim 3, further comprising a cylindrical polycarbonate holder for holding said disk-shaped radioisotopes in said combination of radioisotopes in a stacked configuration. 5. The radiation surrogate of claim 4 wherein said combination of radioisotopes is disclosed in a thermoset resin container. 6. The radiation surrogate of claim 5, wherein said resin container is a clear plastic container. 7. The radiation surrogate of claim 6, wherein said resin container is a spherical container. 8. The radiation surrogate of claim 1, wherein said combination of radioisotopes further comprises at least one radioisotope selected from the group consisting of Co-57 having an activity of about 33 μCi, and Th-228 having an activity of about 4 μCi. 9. The radiation surrogate of claim 8, wherein said combination of radioisotopes is substantially surrounded by tungsten foil. 10. The radiation surrogate of claim 8, wherein said radioisotopes in said combination of radioisotopes are individually sealed. 11. The radiation surrogate of claim 10, wherein said individually sealed radioisotopes in said combination of radioisotopes are disk-shaped. 12. The radiation surrogate of claim 11, further comprising a cylindrical polycarbonate holder for holding said disk-shaped radioisotopes in said combination of radioisotopes in a stacked configuration. 13. The radiation surrogate of claim 11 wherein said combination of radioisotopes is disposed in a thermoset resin container. 14. The radiation surrogate of claim 13, wherein said resin container is a clear plastic container. 15. The radiation surrogate of claim 14, wherein said resin container is a spherical container.