JAEA-Conf 2011-002 - 日本原子力研究開発機構

JAEA-Conf 2011-002
Figure 2 Damage and Coulomb cross sections for the Ge -> W scattering.
Based on the above formalisms, we calculated DPA distributions in W target for 130 MeV/u 76 Ge
and proton irradiations. The number of ions is 9.45×10 16 . Calculated results were compared with those of
TRIM as shown in . We selected “Quick Calculation of Damage” for TRIM option for DPA
calculation. The damage calculated with this option is the quick statistical estimates based on the
Kinchin-Pease formalism. TRIM treats just Coulomb scattering for the projectile and cannot produce
secondary particles from nuclear reactions. PHITS gives good agreements with TRIM results for DPA
values by PKA’s directly created by the projectile such as 76 Ge and proton. On the other hands, for the
proton incident reaction, PKA’s created by the secondary particles is more dominant than PKA’s by the
projectile in DPA calculations. Damage calculation only by PKA’s directly created by the projectile, such as
TRIM, may lead to sever underestimation where projectile energy is high enough to create nuclear
reactions. We conclude that PHITS is more reliable code than TRIM for DPA calculations, especially in the
high-energy region and proton incidence.
Figure 3 DPA calculation using PHITS and TRIM for the 130 MeV/u 76 Ge into W (left) and proton into W
(right).