The Neutron Radiation Detection Instrument-1A (NeRDI-1A) is a neutron sensor on the International Space Station (ISS) as part of the Department of Defense Space Test Program (STP) mission STP-H9. NeRDI-1A uses the scintillator Tl2LiYCl6:Ce as well as three Domino microstructured semiconductor neutron detectors (MSNDs) with varying levels of moderation and an EJ-270 plastic scintillator. The primary objective of NeRDI-1A is to space qualify TLYC and MSND detectors by studying the effects of on-orbit radiation background on the performance of these detectors over the nominal one-year mission. NeRDI-1A was launched to the ISS on 15 March 2023 GMT aboard SpX-27.
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