| タイトル | Radiation effects in soils from five lunar missions. |
| 著者（英） | Phakey, P. P.; Hutcheon, I. D.; Price, P. B.; Rajan, R. S. |
| 発行日 | 1972-01-01 |
| 言語 | eng |
| 内容記述 | Optical and high-voltage electron microscopy were used to study radiation-produced defects. There is no systematic decrease in solar flare track distributions in lunar fines even to a depth of 2.5 m. The soil gradually accumulates in thickness; stirring by impacts is usually on a small scale. The accumulation rate at Luna 16 site is far lower than at the Apollo sites; the mean track density in micron-size grains there exceeds one trillion per sq cm; more than 90% of those grains are metamict; the Luna 16 site is at high longitude where electrostatic charging and transport of soil by geomagnetic tail electrons are minimal. A large fraction of soil grains on sloping ground have been isotropically irradiated, suggesting a tumbling downhill motion.- |
| NASA分類 | SPACE SCIENCES |
| レポートNO | 73A19875 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/458551 |
|
