Calibration of a space thermal/epithermal neutron detector: The Mars Observer Gamma-Ray Spectrometer anticoincidence shield

We explore the use of microstructured semiconductor neutron detectors (MSNDs) to map the ratio between thermal neutrons and higher energy neutrons. The system consists of alternating layers of modular neutron detectors (MNDs), each comprising arrays of twentyfour MSNDs, and high-density polyethylene moderators (HDPE) with gadolinium shielding to filter between thermal neutrons and higher energy neutrons. We experimentally measured the performance of three different configurations and demonstrated that the sensor system prototypes detect and differentiate thermal and epithermal neutrons. We discuss future planetary exploration applications of this compact, semiconductor-based low-energy neutron detection system.

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A semiconductor-based neutron detection system for planetary exploration

Soto

Fronk

Neal

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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Calibration of NASA’s Neutron Spectrometer System (NSS) for landed measurements of hydrogen content of the lunar subsurface

Peplowski¹,

Elphic²,

Fritzler³

et al. 2023

Nuclear Instruments and Methods in Physics Research Section A:

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Characterizing near-surface elemental layering on Mars using gamma-ray spectroscopy: A proof-of-principle experiment

Peplowski

Wilson

Beck

et al. 2018

Nuclear Instruments and Methods in Physics Research Section B:

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Calibration of a space thermal/epithermal neutron detector: The Mars Observer Gamma-Ray Spectrometer anticoincidence shield

Cited by 4 publications

References 9 publications

A semiconductor-based neutron detection system for planetary exploration

A semiconductor-based neutron detection system for planetary exploration

Calibration of NASA’s Neutron Spectrometer System (NSS) for landed measurements of hydrogen content of the lunar subsurface

Characterizing near-surface elemental layering on Mars using gamma-ray spectroscopy: A proof-of-principle experiment

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