AFMAN 24-204(I)/TM 38-250/NAVSUP PUB 505/MCO P4030.19H/ DLAI 4145.3 285 11 DECEMBER 2001 A11.8.2.2.  DOT 6M Metal Packaging.  Authorized only  for solid radioactive materials that do not decompose at temperatures  up  to  121  degrees  C  (250  degrees  F).    Radioactive  decay  heat  output  must  not  exceed  10  watts. Radioactive  materials  in  other  than  special  form  must  be  packaged  in  one  or  more  tightly-sealed  metal  cans  or polyethylene bottles within a DOT specification 2R containment vessel. - Limit  packages  of  fissile  material  with  a  criticality  TI  equal to  0.0  to  1.6  kg  of  uranium  235;  0.9  kg  of plutonium (except that due to the 10-watt thermal decay heat limitation, the limit for plutonium-238 is 0.02 kg); and 0.5 kg of uranium-233.  The maximum ratio of hydrogen to fissile material must not be greater than three, including all of the sources of hydrogen within the DOT 2R containment vessel. - Use  table  A11.5  to  determine maximum  quantities  of  fissile  material  and  other restrictions  for  materials with a criticality TI if greater than 0.0.  The minimum transport index to be assigned per package and, for fissile  material,  controlled  shipments,  the  allowable  number  of  similar  packages  per  transport  vehicle  is shown in table A11.5.  Where a maximum ratio of hydrogen to fissile material is specified in table A11.5, only the hydrogen interspersed with the fissile material has to be considered.  For a uranium-233 shipment, the  maximum  inside  diameter  of  the  inner  containment  vessel  must  not  be  over  12.1  cm  (4.75  inches). Where  necessary,  use  a  tight-fitting  steel  insert  to  reduce  a  larger  diameter  inner  containment  vessel specified in 49 CFR 178.354 to the 12 centimeters (4.75 inches) limit. Table A11.5.  Authorized Contents for Specification 6M Packages (note 1) Uranium-233 (note 5) Uranium-235 (note 4 and 7) Plutonium (note 2, 3, and 4) Minimum Transport Index Maximum Number of Packages Transported as a Fissile Material Control Shipment Metal or Alloy Compounds Metal or Alloy Compounds Metal or Alloy Compounds H/X = 0 (note 8) H/X = 0 H/X     <=3 H/X = 0 H/X = 0 H/X    <=3 H/X     = 0 H/X = 0 H/X     <=3 0.5 0.5 0.5 1.6 1.6 1.6 0.9 (note 9) 0.9 (note 9) 0.9 (note 9) 0 NA 3.6 4.4 2.9 7.2 7.6 5.3 3.1 4.1 3.4 0.1 1,250 4.2 (note 6) 5.2 3.5 8.7 9.6 6.4 3.4 4.5 4.1 0.2 625 5.2 (note 6) 6.8 4.5 11.2 13.9 8.3 4.2 --- 4.5 0.5 250 --- --- --- 13.5 16.0 10.1 4.5 --- --- 1.0 125 --- --- --- --- 26.0 16.1 --- --- --- 5.0 25 --- --- --- --- 32.0 19.5 --- --- --- 10.0 12