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SUMMARY:Impact of helium (He) in the migration of strontium implanted 6H-S
 iC
DTSTART;VALUE=DATE-TIME:20210726T101500Z
DTEND;VALUE=DATE-TIME:20210726T103000Z
DTSTAMP;VALUE=DATE-TIME:20260614T130755Z
UID:indico-contribution-7091@events.saip.org.za
DESCRIPTION:Speakers: Thapelo Freddy Mokgadi (University of Pretoria)\n**I
 mpact of Helium (He) in the migration of strontium implanted 6H-SiC**\n\n 
   T.F. Mokgadi$^1$\, T.T. Hlatshwayo$^1$\, M. Msimanga$^2$\, V.A. Skuratov
 $^3$\n\n   ‎$^1$ *Physics Department\, University of Pretoria\, Pretoria
 \, South Africa*.‎\n   $^‎2$ *Physics Department\, Tshwane University 
 of Technology\, P Bag X680\, Pretoria 0001\, South Africa ‎*\n        
 ‎$^3$ *Joint Institute for Nuclear Research\, Dubna\, Russia*\n\n‎Sili
 con carbide (SiC) is regarded as the main candidate material for nuclear e
 nergy ‎application\, such as a structural material in future fusion reac
 tors and as fuel cladding in ‎future generation fission reactors\, based
  on its low neutron capture cross-section\, outstanding ‎chemical and th
 ermal stability. In fission reactors such as the PBMR\, the fuel particle 
 (TRISO ‎particle) where SiC is the main diffusion barrier of fission pro
 ducts (FPs)\, is able to retain ‎most of the radiologically important FP
 s with the exception of strontium ($^{90}$Sr)\, Europium (Eu) ‎and silve
 r (Ag). $^{90}$Sr is an isotope of naturally occurring nontoxic and nonrad
 ioactive ‎strontium\, it is also a by-product of fission reactions in nu
 clear reactors with yields of about ‎‎5.7% and 6.6% from U-235 and U-2
 33\, respectively. It has a half-life of about 29 years and ‎undergoes a
  beta decay into yttrium-90 ($^{90}$Y) accompanied by a decay energy of ab
 out 0.55 ‎MeV. This\, is the more reason why it is important to investig
 ate the retention of Sr in the ‎TRISO particle\, specifically SiC. Simul
 taneous to the release of FPs in fission reactions is the ‎release of al
 pha-particles. Alpha-particles/helium ions (He$^+$) are a product of nucle
 ar ‎reactions with generation rates of about 2.5 appm He/dpa and have be
 en reported to form ‎bubbles in SiC which in the long run compromises it
 s structural integrity. Therefore\, in the ‎nuclear reactor environment 
 SiC will be exposed to high dose\, temperature irradiation\, and ‎He$^+$
  generation. ‎We will be presenting the results of a study that looks in
 to the dual implantation of Sr and He at room temperature and the impact o
 f He bubbles in the Sr migration in SiC at high temperatures.\n\n\n‎\n\n
 https://events.saip.org.za/event/206/contributions/7091/
LOCATION:North-West University Potchefstroom Campus
URL:https://events.saip.org.za/event/206/contributions/7091/
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