Internal Correspondence
         
         MARTIN MARTIN MARIETTA ENERGY SYSTEMS. INC.
         
         
         April 29, 1991
         
         To: Distribution
                          
         From: J. E. White, 6025, MS 6362, 4-6176
         
         Availability of the Official Release of ENDF/B VI
         
         The purpose of this memorandum is to announce the release of the latest Evaluated
         Nuclear Data File (ENDF) for general use at ORNL. ENDF/B-VI evaluations are
         released with no restrictions on their distribution or use. RSIC continues to be the
         ORNL point of contact for receiving and distributing nuclear data in ENDF/B format.
         As a reminder, the DOE restrictions on ENDF/B-V are still in effect. Please
         continue to coordinate with RSIC in responding to ENDF/B-V interest outside
         ORNL.
         
         The following ENDF/B-VI Tapes have been processed through CHECKR, FIZCON,
         and PSYCHE. They are:
         
         ENDF/B-VI Tapes 100-117, neutron sublibraries
         ENDF/B-VI Tapes 118-119, thermal scattering sublibraries
         ENDF/B-VI Tapes 700-706, photon interaction sublibraries
         ENDF/B-VI Tape 800, neutron sublibrary (high energy Fe)
         ENDF/B-VI Tape 801, proton sublibrary (high energy Fe).
         
         The final ENDF/B-VI sublibraries for charged particles, radioactive decay data and
         fission product yields are expected in the fall of this year.
         
         To avoid duplication of effort, a compilation by R. Q. Wright of useful information
         about the contents of selected neutron sublibraries is provided as Attachment #1.
         To facilitate the use of Table 1 in the attachment, entries in the MAT and OTHER
         columns may need clarification. They are:
         
         MAT(*),         new evaluation for ENDF/B-VI
         OTHER (GAMMA), material has gamma-ray production data
         OTHER (MF=6), File 6 energy and angle data given.
         
         Table 1 in the attachment is also available on diskette from R. Q. Wright if anyone
         is interested.
         
         As a reminder to some, new evaluations for natural elements are not available in
         ENDF/B-VI. Cross sections are provided on an isotopic basis.
         
         Please contact me if you have any questions or wish access to ENDF/B-VI data.