Microwave brightness temperature imaging and dielectric properties of lunar soil

Among many scientific objectives of lunar exploration, investigations oil lunar soil become attractive due to the existence of He-3 and ilmenite in the lunar soil and their possible utilization as nuclear fuel for power generation. Although the composition of the lunar surface soil can be determined by optical and gamma/X-ray spectrometers, etc., the evaluation of the total reserves of He-3 and ilmenite within the regolith and in the lunar interior are still not available. In this paper, we give a rough analysis of the microwave brightness temperature images of the lunar disc observed using the NRAO 12 meter Telescope and Siberian Solar Radio Telescope. We also present the results of the microwave dielectric properties of terrestrial analogues of lunar soil and, discuss some basic relations between the microwave brightness temperature and lunar soil properties.