Patent Number: 050842340
Section: claims

1. An absorption casing for a source of radioactive radiation comprising a first layer (36) having means for absorbing gamma radiation, a second layer (38) having means for absorbing neutron radiation, a third layer (42) having means for absorbing alpha and beta radiation, a fourth layer (44) having gas-impermeable means for enclosing a source of radioactive radiation and for retaining gaseous fission products, said first through fourth layers being disposed in consecutive adjacent relationship to each other, all said first through fourth layers (36, 38, 42 and 44) being spaced from each other and surrounding a source of radioactive radiation with said fourth layer (44) being the layer closest to said source, said fourth layer (44) being zirconium or a zirconium alloy, and a layer (34, 40, 46, 48) of an elastic material being arranged between each pair of spaced adjacent layer (32, 36, 38, 42, 44) of said absorption casing. 2. The absorption casing as defined in claim 1 wherein the second layer (38) comprises hafnium. 3. The absorption casing as defined in claim 1 including a fifth layer (32) comprised of titanium.