Measurement of the lunar neutron density profile
Abstract
An in situ measurement of the lunar neutron density from 20 to 400 g/sq cm depth between the lunar surface was made by the Apollo 17 Lunar Neutron Probe Experiment using particle tracks produced by the B10(n, alpha)Li7 reaction. Both the absolute magnitude and depth profile of the neutron density are in good agreement with past theoretical calculations. The effect of cadmium absorption on the neutron density and in the relative Sm149 to Gd157 capture rates obtained experimentally implies that the true lunar Gd157 capture rate is about one half of that calculated theoretically.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1974
- Bibcode:
- 1974STIN...7523440W
- Keywords:
-
- Apollo 17 Flight;
- Lunar Surface;
- Neutron Distribution;
- Boron Isotopes;
- Cadmium Isotopes;
- Capture Effect;
- Gadolinium Isotopes;
- Lithium Isotopes;
- Particle Tracks;
- Samarium Isotopes;
- Lunar and Planetary Exploration