| タイトル | Carbon-14 activities in recently fallen meteorites and Antarctic meteorites |
| 著者（英） | Linick, T. W.; Donahue, D. J.; Jull, A. J. T. |
| 著者所属（英） | Arizona Univ. |
| 発行日 | 1989-08-01 |
| 言語 | eng |
| 内容記述 | This paper reports C-14 measurements in meteorites using an extraction method which employs RF melting of samples as small as 0.1 g. A study of extraction of cosmic-ray-produced C-14 in samples of Bruderheim gave C-14 levels between 38 and 60 dpm/kg for samples which had been preheated in air between 250 and 700 C, with a mean value of 46.8 + or - 1.4 dpm/kg. A range of values between 35 and 59 dpm/kg was found for other falls of saturated meteorites preheated to 500 C. The preheating step is shown to be effective in removing terrestrial carbon contamination. A series of samples previously dated by Kr-81 as having ages of 120-310 kyr gave C-14 levels of between less than 0.16 and 0.37 + or - 0.10 dpm/kg. These levels are consistent with levels of in situ production by cosmic rays at the earth's surface. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 89A51765 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/361632 |
