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Commission, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. I N T R O D U C T I O NThe R a d i a t i o n S h i e l d i n g I n f o r m a t i o n C e n t e r (RSIC) s e r v e s as a r e p o s it o r y f o r t h e Defense Nuclear Agency (DNA) c r o s s -s e c t i o n l i b r a r y . This i s a working l i b r a r y i n ENDF' format whose c o n t e n t can b e m o d i f i e d and r ev i s e d whenever t h e e v a l u a t o r deems such changes t o be n e c e s s a r y . The key t o t h i s approach i s a s e l e c t e d e v a l u a t o r , t h e p e r s o n r e s p o n s i b l e for making t h e o r i g i n a l e v a l u a t i o n f o r a p a r t i c u l a r element or elements.i s t h e n r e s p o n s i b l e for a u t h o r i z i n g changes i n e v a l u a t i o n s f o r t h o s e elements. The e v a l u a t e d d a t a a r e f o r t h o s e m a t e r i a l s o f i n t e r e s t t o D N A , whose c r o s s -s e c t i o n v a l u e s a r e i n a s t a t e o f r a p i d f l u x , and emphasis i s p l a c e d on n e u t r o n e n e r g i e s up t o 2 0 MeV and on secondary gamma-ray p r od u c t i o n . E v a l u a t i o n s o f i n t e r e s t t o DNA which a r e n o t i n a s t a t e of r a p i d change are found i n t h e ENDF/B l i b r a r y , which i s a v a i l a b l e from t h e N a t i o n a l Neutron Cross S e c t i o n C e n t e r a t Brookhaven N a t i o n a l L a b o r a t o r y . r e v i e w e r s w i l l be provided w i t h l i s t i n g s , o u t p u t from checking c o d e s , g r a p h i c s , e t c . , and asked t o r e v i e w t h e d a t a and f e e d back t h e i r comments.These w i l l be r e l a y e d t o t h e e v a l u a t o r and, upon h i s i n s t r u c t i o n , a p p r o p r ia t e changes w i l l be made.Next, DNA Phase I d a t a t e s t i n g i s performed whereby s e l e c t e dThe d a t a , a l o n g w i t h a v a i l a b l e documentation, are d i s t r i b u t e d upon r e q u e s t .u s i n g t h e d a t a .The u s e r s a r e asked t o f e e d back any comments t h e y have t h r o u g hThe o f f i c i a l DNA l i b r a r y w i l l b e m a i n t a i n e d a t RSIC. Changes t o i t w i l l be i n i t i a t e d o n l y by t h e e v a l u a t o r and each change w i l l b e documented so t h a t u s e r s c a n , a t any t i m e r e f e r t o an i d e n t i f i a b l e d a t a set when r e p o r t i n g r e s u l t s of t h e i r c a l c u l a t i o n s . 1.1Because t h e d a t a are a p t t o b e r e v i s e d w i t h some f r e q u e n c y , eachThe DNA e v a l u a t i o n i s d e s i g n a t e d by a DNA MAT number and a MOD number.MAT number i s a unique i d e n t i f i c a t i o n number for an e v a l u a t i o n and i s e q u a l t o ENDF MAT number p l u s t h r ...