D kchkn er This docum e n t w a s pEpaEd as an account of w ork sponsoEd by an agency of the Un&d States Govern ent. Nefierthe Un&d States Govern e n t n o r the U n k r s 3 y of C a m r n i a n o r any of their employees, makes any warranty, expEss o r knpplied, o r assumes any legal liabilky o r Esponsbilky 6 r the accuracy, completeness, o r u s e f i h e s s of any in6m ation, apparatus, product, o r process disclosed, o r E p E s e n t s that ks use w ould n o t inhringe p r k t e & owned

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... Qhts. R e g E n c e h e E k to any spec& com m enzialproducts, process, o r s e e by -de nam e , &idem a&, m anuBciuEr, o r otherw ise does n o t n e c e s s a a constilute o r kn p& ks endorsem ent, Ecom m endation, o r avoring by the Un&d States G o v e r n e n t o r the U n k r s 3 y of C a m r n i a . The View s and opinbns ofauthors expEssed h e E k do n o t n e c e s s a a state o r E f k c t t h o s e ofthe Un&d States Govern e n t o r the U n k r s 3 y of C a m r n i a , and shall n o t be used 6 r advertising o r product endorsem e n t purposes. This port h a s been Eproduced d k c t s y hrom the best availabk copy. A v a i l a b k t o D O E andDOE contmctorshrom the 0 &e of S c k n t i k and T e c h n i c a l B 6 m a t b n P.0 .Box 62, Oak Rklge, TN 37831 P e e s availabk hrom (615) 576-8401, FTS 626-8401