Characterization of 3 MeV H+ irradiation induced defects in nuclear grade graphite

✍ Scribed by Eung-Seon Kim; Yong-Wan Kim

• Book ID: 104093900
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 595 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.06.036

✦ Synopsis

Atomistic structure change in a nuclear grade graphite irradiated at 353 K to 3.4 × 10 17 ion/cm 2 with 3 MeV H + was characterized by measuring positron lifetime and Raman spectrum at room temperature. It is evident from the positron lifetime results that the pre-existing structural defect is disoriented crystalline boundaries, and vacancy clusters ranging from di-to quadruple-vacancies were newly formed after ion irradiation. The relative intensity ratio of the Raman D and G peaks increased from 0.25 to 0.67 after ion irradiation. The concentration of radiation-induced vacancies was reasonably estimated by the Raman intensity ratio.