Bhandari, N. ; Bhattacharya, S. K. ; Padia, J. T. (1975) The surface radioactivity of lunar rocks - Implications to solar activity in the past Proceedings of the Lunar and Planetary Science Conference, 2 . pp. 1913-1925. ISSN 0270-9511
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Abstract
A nondestructive beta-gamma coincidence technique was used to measure the radioactivity of lunar rocks both at and near the top surface. The surface of the Apollo 16 rock 61016 has a four times higher positron emitter concentration than does the rock at a depth corresponding to 4 g/sq cm. The activity is attributed to the solar-flare-produced radionuclide Al-26. The surface exposure age and the erosion rate for 61016 were estimated from track density profile and microcrater size distribution studies. The Al-26 depth profile (corrected for surface erosion) indicates an average solar-flare activity during the last 1.5 m.y. which can best be represented by a stated exponential rigidity spectrum.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Lunar and Planetary Institute. |
| ID Code: | 87278 |
| Deposited On: | 16 Mar 2012 11:25 |
| Last Modified: | 03 Jul 2012 04:45 |
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