摘要: A slow positron beam generator using well-annealed polycrystalline tungsten moderators and a Na-22 positron source was developed. A 250 micro c source, deposited on a 2.54 micrometer thick aluminized mylar, is sandwiched between t... 展开
作者 | Singh, J. J. Eftekhari, A. St. Clair, T. L. | ||
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原报告号 | N8925433 | 总页数 | 15 |
报告类别/文献类型 | NASA / NTIS科技报告 | ||
关键词 | Polyimides Polymeric films Life (Durability) Particle beams Positron annihilation Positrons Sodium 22 Spectroscopy Thin films Amorphous materials Crystallinity Film thickness Moderators Molecular structure Tungsten |