Patent Number: 055043445
Section: claims

1. A radiation attenuating shield for reduction of radiation flux emanating from a radioactive radiation source, said radiation source being within a containment zone selectively sealed by a closure component, said closure component being movable from a non-sealing position to a sealing position, a gap being defined about said closure component in the sealing position thereof, said shield comprising means within said gap for allowing only collimated radiation to pass through said gap and for precluding free passage of angularly directed radiation flow. 2. The radiation attenuating shield of claim 1, wherein said containment zone is defined within a containment vessel having an opening therein defined by a surrounding vessel opening surface, said closure component engaging within said opening and having a component surface paralleling said vessel opening surface with said gap defined therebetween, said radiation shield being defined by said component surface and said vessel surface. 3. The radiation attenuating shield of claim 2, wherein said component surface and said vessel opening surface comprise alternating complementary ridges and grooves extending along a length of the gap and along the radiation path from the containment zone, said ridges and grooves being in interdigitated relation with each other when the closure component is in the sealing position and defining radiation absorbing and reflection barriers relative to isotropic radiation flux. 4. The radiation attenuating shield of claim 3, wherein said alternating ridges and grooves define a triagonal interface. 5. The radiation attenuating shield of claim 4, wherein said triagonal interface includes defined 90 degree angles in said complementary ridges and grooves. 6. In the combination of a containment vessel and a closure, said containment vessel having an opening defined by a surrounding vessel opening surface, said closure engaging with said opening and having a closure surface paralleling said vessel opening surface; a radiation shield between said vessel opening surface and said closure surface with a gap therebetween, said gap having an inner end and an outer end, said shield comprising attenuating ridges and grooves defined on each of said vessel opening surface and said closure surface, and extending longitudinally between said inner end and said outer end, said ridges and grooves on each of said vessel opening surface and said closure surface interdigitating with the ridges and grooves on the other of said vessel opening surface and said closure surface.  wherein said containment zone is defined within a containment vessel having an opening therein defined by a surrounding vessel opening surface, said closure component engaging within said opening and having a component surface paralleling said vessel opening surface with said gap defined therebetween, said radiation shield being defined by said component surface and said vessel surface. 7. In the combination of claim 6, wherein said gap includes, between said inner end and said outer end thereof, a laterally offset portion, said ridges and grooves extending along said laterally offset portion. 8. A radiation attenuating shield for reduction of radiation flux emanating from a radioactive radiation source, said radiation source being within a containment zone selectively sealed by a closure component, a gap being defined about said closure component in a sealing position thereof, said shield comprising means within said gap for allowing only collimated radiation to pass through said gap and for precluding free passage of angularly directed radiation flow; 9. The radiation attenuating shield of claim 8, wherein said component surface and said vessel opening surface comprise alternating complementary ridges and grooves extending along a length of the gap and along the radiation path from the containment zone, said ridges and grooves being in interdigitated relation with each other when the closure component is in the sealing position and defining radiation absorbing and reflection barriers relative to isotropic radiation flux. 10. The radiation attenuating shield of claim 9, wherein said alternating ridges and grooves define a triagonal interface. 11. The radiation attenuating shield of claim 10, wherein said triagonal interface includes defined 90 degree angles in said complementary ridges and grooves.