The 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.
Radioactivities vs. depth in Apollo 16 and 17 soil
Lunar Science Conference ; 1973 ; Houston, TX
1973-01-01
Miscellaneous
No indication
English
Radioactivities in returned lunar materials
NTRS | 1972
Radioactivities in Returned Lunar Materials
NTIS | 1972
Gamma-Line Emission from Radioactivities Produced in Supernovae
British Library Online Contents | 1997
|Apollo drill core depth relationships
NTRS | 1974
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