Reinforced radiological containment bag
View Patent ↗Radiological containment bags for use in storing alpha particle emitting waste are described. The radiological containment bags are formed of a multilayer film with an inner layer of the film being a sacrificial layer that lies between the interior of the bag and a structural polymeric layer. The sacrificial layer includes a flexible composite material that in turn includes a polymeric matrix and an alpha particle energy absorber incorporated in the polymeric matrix. The sacrificial layer can include a chromophore that can detect early degradation of the sacrificial material.
1. A flexible composite material, the flexible composite material including a polymeric matrix, a first chromophore, and an alpha particle energy absorber incorporated in the polymeric matrix, the alpha particle energy absorber comprising a conjugated ring system comprising carbon and including at least two conjugated rings, the alpha particle energy absorber further comprising a metal hydride.
2. The flexible composite material of claim 1 , wherein the first chromophore comprises a substituted or unsubstituted phenyl group, a substituted or unsubstituted anthracyl group, a substituted or unsubstituted phenanthryl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted heterocyclic ring, or combinations thereof.
3. The flexible composite material of claim 1 , wherein the first chromophore comprises one or more of anthracene, tetracene, pentacene, naphthodiothiophene, or anthradithiophene, or combinations thereof.
4. The flexible composite material of claim 1 , comprising a second alpha particle energy absorber.
5. The flexible composite material of claim 1 , the flexible composite material having a net positive charge.
6. The flexible composite material of claim 5 , wherein the polymeric matrix comprises a polymer having a positive charge.
7. The flexible composite material of claim 1 , the polymeric matrix comprising a polyvinyl alcohol, a polyurethane, a polyolefin, a polyacrylate, a cellulose, a polyester, a polyisoprene, a polystyrene, a polysulfone, a polycarbonate, a polyoxymethylene, a polytetrafluoro ethylene, a polyetherketone, a polysiloxane, an elastomer, or a copolymer or blend comprising one or more thereof.
8. The flexible composite material of claim 1 , the alpha particle energy absorber having an electron density of about 3.0×10 23 electrons per cubic centimeter or greater.
9. The flexible composite material of claim 1 , wherein the conjugated ring system comprising carbon comprises a fullerene, graphene, or a carbon nanotube.
10. The flexible composite material of claim 1 , wherein the alpha particle energy absorber comprises C 60 derivatized with the metal hydride.
11. The flexible composite material of claim 1 , further comprising a second chromophore.
12. The flexible composite material of claim 1 , wherein the metal hydride comprises NaAlH 4 , LiAlH 4 , or LiBH 4 .
13. A flexible composite material, the flexible composite material including a polymeric matrix, a first chromophore, and an alpha particle energy absorber incorporated in the polymeric matrix, the alpha particle energy absorber comprising a heteroaryl conjugated ring system and a metal hydride.
14. The flexible composite material of claim 13 , the flexible composite material having a net positive charge.
15. The flexible composite material of claim 13 , wherein the polymeric matrix comprises a polymer having a positive charge.
16. The flexible composite material of claim 13 , wherein the heteroaryl conjugated ring system comprises one or more of furan, pyrrole, and thiophene.
17. The flexible composite material of claim 13 , wherein the heteroaryl conjugated ring system comprises anthracene, tetracene, pentacene, naphthodithiophene, or anthrdithiophene.