| タイトル | The measurement of trace elements in interplanetary dust and cometary particles by ultra-high sensitivity INAA |
| 本文（外部サイト） | http://hdl.handle.net/2060/19900007340 |
| 著者（英） | Zolensky, M. E.; Lindstrom, M. M.; Lindstrom, David J.; Lindstrom, Richard M. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 1989-01-01 |
| 言語 | eng |
| 内容記述 | Today the major elemental composition of interplanetary dust particles (IDPs) is routinely determined in many laboratories. These and mineralogical studies have revealed the presence of at least two major types of IDPs, chondritic and refractory. Preliminary results of a successful attempt to determine abundances of a large suite of trace elements from both chondritic and refractory IDPs are reported. The analytical procedure can be used in the grain-by-grain analysis of returned cometary samples. Chondritic and refractory IDPs are characterized by standard scanning electron microscopy and energy dispersive x ray spectroscopy (SEM-EDX) techniques. With this system, detection limits for many elements are well below picogram levels, and some approach femtogram levels. This technique is non-destructive, although some sample handling is required, so particles can be analyzed by other techniques after instrument neutron activation analysis (INAA) is completed. Data is presently being reduced from the analyses of 7 IDPs. These are U2015E10, U2015F1, W7029-A2, W7029-A3, W7013A8, LACl (all chondritic) and 705 (refractory). So far, 17 different major and trace elements were detected and measured in these particles, including rare earths and some very volatile elements (Br and Zn). |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 90N16656 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/139158 |
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