This repwt was p r e p 4 as an acrwnt of m r k sponsored by the United S t a t u Covtrnmcnt. Neither the Unit4 h t c s nor h e Department of Emrgy. nor any d their e r n p l o~~e~. nor any of their contrartors, sukontnaarr, or their e n p l o w , makes any warranty, e x p m or imp!ied, or m m e s any h a 1 liability or ruponribility for the accuracy, mptetenor usefulness ol any information, apparatus, p d u a w procm i i~h e d , or rewesents thai tts use mmld not infringe privately M righa. Tbe

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... v i m , opinions and condusiom c o a t a i d in this rtport ue r h m of the contractor and do not n -w r i l y reprixent rhme of the Unit4 %am Government or the United Stat-thpanment of Energy. PACIFIC NORTHV!EST LABORATORY operated by BATTELLE for the UNITED STATES DEPARTMENT O F ENERCt Under Con fracr E Y-76-C-06-1830 Printed In he U m l d Stat= at A m e r~a Availnble from Wh0tIal rrchniul lnlorrmllon ~M C E Lnitcd Sum Oapanment ot Commtm 5285 Port Ropl W Springfield, Vlrglnlo 22rS?