DT FUSION NEUtRON EDITION STREVGTHENIN  OF COPPER At\D \IOnil
J. B. Mitchell                D. M. Parktn
R. A. Van Knnynnburg"        C. J. Echer*
Lavrenc iuvcrore Laoraory, t.ivermore, CA
+loa Alamos Scientiiic Laboratory, Loa Alamos, N
ABSTRACT
The initial rosults of a comparative study of the radi-
ation strengthening and damage structures produced in tu nd
Nb by D-T fusion and fission reactor neutrons are dsmrid.
The radiation strenguiontmg praducd by a givcn luenc oa
fusion neutrons above about 1017n/cm2 is eqtuol to chat pro-
ducad by a fiaonoe of fission reactor neutrons (E    i1 Vt)
ten times as gre.t. This difference ts about twce as large
as mond be oxpucted if the strengthening truird cithl dagr
ergy or dpa. Initial trannmission electron microscnpy
obsrvatoons of the damage structures in fusion and finmion
actor nutron irradiated copper indicate that thr s      type
of primary structural defects, aracut and interstitial point
defect clusters and small disloation loos oth a/ (111)
and al (It0) Burgers vrtors, or paoducrd in both coes.
The difference in th    o diton strengthening podace  by
fusion and fission reactor neutrons in Cu appears to rcult
fro    substantially greater rate of aocumulaion of dAi e.',
in tie torn of pon defect  tltrs, during irradiaoiott s th
fusion nturns than during irradiation cith fissoln rec  or
neutrons pltm a significant difference in the sire and nsatl
distributions of tie damage clusters.
ISTOD'CTIM
The recent groch of interest in controlled steronucluar rautor
(CTO) technology has generated censiderable discuss tun of te effctr0  of
14  et D-T uosio  natryn radiation damage on candidate atrctraf
natoials - or itsion records.