▎ 摘　　要

NOVELTY - Box comprises rare metal and alloy system layer (1), tantalum-tungsten-based alloy layer (2), carbon-based material layer (3), and nickel-copper-based alloy layer (4), where the rare metal and alloy system layer includes ruthenium, rhodium, palladium, osmium, iridium, platinum, thorium and alloy systems; the tantalum-tungsten-based alloy layer is tantalum or tungsten alloy; the carbon-based material layer is a carbon fiber structure or a graphene structure composite material or a carbon-based composite material; and the nickel-copper-based alloy layer includes zirconium, titanium, niobium, and/or vanadium strengthening agents. USE - The box is useful for radioactive sources used to package batteries in extreme deep-sea environments. ADVANTAGE - The box has high melting point, high strength, good corrosion resistance and high mechanical property. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a radioactive source packaging structure; and a battery. DESCRIPTION OF DRAWING(S) - The drawing shows an axial sectional view of a box for packaging a radioactive source of a battery in a deep sea extreme environment. 1Experimental example 2Tantalum tungsten-based alloy layer 3Carbon-based material layer 4Nickel-copper-based alloy layer 5Radioactive isotope battery box