Patent Number: 
Section: claims

1. A neutron shielding material composition comprising:a polymerization initiator;a polymerization component;a refractory material having higher density than that of a resin component comprising said polymerization initiator and said polymerization component;a density increasing agent having higher density than that of said refractory material;a boron compound,wherein said neutron shielding material composition maintains the density of a base resin comprising said resin component and said refractory material; andwherein density of the neutron shielding material composition is from 1.62 g/cm3 to 1.72 g/cm3. 2. The neutron shielding material composition according to claim 1, wherein the composition does not comprise a curing agent. 3. The neutron shielding material composition according to claim 1, wherein the polymerization component comprises an epoxy component. 4. The neutron shielding material composition according to claim 3, wherein the epoxy component comprises a hydrogenated epoxy compound. 5. The neutron shielding material composition according to claim 3, wherein the epoxy component comprises a compound of the structural formula (1):wherein X is at least one compound selected from the group consisting of compounds of the structural formulas (2), (3), (4), (5) and (6):wherein R1 to R4 are each independently selected from the group consisting of CH3, H, F, Cl and Br, and n is 0 to 2 in the structural formula (2), R5 to R8 are each independently selected from the group consisting of CH3, H, F, Cl and Br, and n is 0 to 2 in the structural formula (3), n is 1 to 12 in the structural formula (5), and n is 1 to 24 in the structural formula (6). 6. The neutron shielding material composition according to claim 3, wherein the epoxy component comprises a compound of the structural formula (14):wherein n is 1 to 3. 7. The neutron shielding material composition according to claim 3, wherein the epoxy component comprises at least one compound selected from the group consisting of compounds of the structural formulas (7), (8), (15), and (17):wherein R9 is a C1-10 alkyl group or H, and n is 1 to 24; a compound of the structural formula (8):wherein n is 1 to 8; a compound of the structural formula (15):wherein n is 1 to 3; and a compound of the structural formula (17) 8. The neutron shielding material composition according to claim 1, further comprising a compound for increasing the hydrogen content in the composition. 9. The neutron shielding material composition according to claim 1, wherein the compound for increasing the hydrogen content in the composition comprises at least one of compounds of the structural formulas (9) and (10):wherein n is 1 to 3. 10. The neutron shielding material composition according to claim 1, comprising an oxetane compound as the polymerization component. 11. The neutron shielding material composition according to claim 10, wherein the oxetane compound comprises at least one of compounds of the structural formulas (19) and (20) 12. The neutron shielding material composition according to claim 1, wherein the polymerization initiator comprises a cationic polymerization initiator. 13. The neutron shielding material composition according to claim 12, wherein the cationic polymerization initiator comprises a compound of the structural formula (11) or (16):wherein R10 is a hydrogen atom, a halogen atom, a nitro group or a methyl group, R11 is a hydrogen atom, CH3CO or CH3OCO, and x is SbF6, PF6, BF4 or AsF6. 14. The neutron shielding material composition according to claim 1, further comprising a filler. 15. The neutron shielding material composition according to claim 1, wherein the refractory material comprises at least one of magnesium hydroxide and aluminum hydroxide. 16. The neutron shielding material composition according to claim 1, wherein the density increasing agent is a metal powder having a density of 5.0 to 22.5 g/cm3, a metal oxide powder having a density of 5.0 to 22.5 g/cm3, or a combination thereof. 17. A neutron shielding material produced from the neutron shielding material composition according to claim 1. 18. A neutron shielding container produced from the neutron shielding material according to claim 17. 19. The neutron shielding material composition according to claim 15, wherein said magnesium hydroxide is obtained from sea water magnesium.