| タイトル | Induced radioactivity of LDEF materials and structural components |
| 著者（英） | Harmon, B. A.; Reedy, R. C.; Camp, D. C.; Reeves, J. H.; Fishman, G. J.; Lindstrom, D. J.; Frederick, C. E.; Moss, C. E.; Laird, C. E.; Benton, E. V.; Smith, A. R.; Parnell, T. A.; Winn, W. G.; Hurley, D. L. |
| 発行日 | 1996-11-01 |
| 言語 | eng |
| 内容記述 | We present an overview of the Long Duration Exposure Facility (LDEF) induced activation measurements. The LDEF, which was gravity-gradient stabilized, was exposed to the low Earth orbit (LEO) radiation environment over a 5.8 year period. Retrieved activation samples and structural components from the spacecraft were analyzed with low and ultra-low background HPGe gamma spectrometry at several national facilities. This allowed a very sensitive measurement of long-lived radionuclides produced by proton- and neutron-induced reactions in the time-dependent, non-isotropic LEO environment. A summary of major findings from this study is given that consists of directionally dependent activation, depth profiles, thermal neutron activation, and surface beryllium-7 deposition from the upper atmosphere. We also describe a database of these measurements that has been prepared for use in testing radiation environmental models and spacecraft design. |
| NASA分類 | Life Sciences (General) |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/300908 |
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