A neutron activation gamma ray spectrometer for planetary surface analysis

• Published in: Acta Astronautica
• Main Authors: Bradley, J. G., Schweitzer, J. S., Truax, J. A., Rice, A., Tombrello, T. A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Elsevier 1995
• Subjects: Venera; Venus; Ice cap
• Online Access: https://authors.library.caltech.edu/59902/; https://resolver.caltech.edu/CaltechAUTHORS:20150826-101417048

A pulsed DT neutron generator system, similar to that used in commercial well logging, offers the possibility of performing accurate elemental analyses to depths of tens of centimeters in a few seconds with the probe on the body's surface. Through time-phased measurements of the gamma-ray spectrum synchronized with the neutron pulses, concentrations of hydrogen, carbon and key mineral forming elements can be determined even with a low-resolution spectrometer. If a high resolution spectrometer is used, the number of elements measured and the sensitivity for measurement is increased. An implanted probe system, such as in a comet or ice cap penetrator, would offer the highest possible sensitivity. An inexpensive neutron probe system based on modifications of the Schlumberger well-logging system has been proposed for the Discovery/Venera/SAGE Mission to Venus and the Mars Polar Pathfinder. Preliminary experiments on a simulated Venusian surface indicate that high quality results can be obtained.