Radioactivities vs. depth in Apollo 16 and 17 soilThe radioactivities of Ar-37, Ar-39, and H-3 measured at a number of depths for Apollo 16 and 17 soil are reported. The Ar-37 activities vs depth in the Apollo 16 drill string increased with depth and reached a broad maximum in the neighborhood of 50 g per sq cm before decreasing. The Ar-39 activities in Apollo 17 soil were higher than in Apollo 16 soil, probably owing to the higher Fe and Ti contents. The H-3 activities in Apollo 16 and 17 soil were quite similar and indicate that the 4 August 1972 flare produced very little H-3 compared to the amount produced by solar flares during the previous 50 years.
Document ID
19740040195
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Fireman, E. L.
D'Amico, J.
Defelice, J. (Smithsonian Astrophysical Observatory Cambridge, Mass., United States)