Gamma-ray spectrometer onboard Chang'E-2

Ma, Tao; Chang, Jin; Zhang, N.; Wu, Jing; Cai, Mingsheng; Gong, Yuan; Tang, H. S.; Zhang, R. J.; Wang, N. S.; Yu, Min‐Feng; Mao, J.; Hu, Yiming; Xu, A.; Zhu, M. H.

doi:10.1016/j.nima.2013.05.162

Cited by 15 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The LaBr 3 crystal provides excellent detection features, such as high light yield, short dead time, outstanding energy resolution, and consistent light output [7]. Due to its excellent properties, LaBr 3 scintillator detectors are used by many space science missions [5,8]. In the crystal, the energy released following the interaction of photons is transformed into fluorescence, which is subsequently turned into electrons at the photocathode of PMT.…”

Section: Jinst 17 P05045mentioning

confidence: 99%

Pre-launch characterization of the spectrometer of Hard X-ray Imager (HXI) onboard the ASO-S mission

Liu¹,

Zhang²,

Wu³

et al. 2022

J. Inst.

Self Cite

View full text Add to dashboard Cite

As one of the three payloads of the Advanced Space-based Solar Observatory (ASO-S), the pre-launch characterization of HXI includes the characterization of the collimator and the spectrometer. This article focuses on the pre-launch characterization of HXI's spectrometer, including detection efficiency, energy resolution, and energy to ADC channel (E-C) relationship. The detection efficiency characterization necessitates a sufficient number of calibrated energy points in the HXI observation energy range, with a refined measurement around the absorption edge of the lanthanum bromide crystal, and is calibrated with an X-ray beam. The characterization results are consistent with the simulations and show that the detection efficiency difference between detector modules is controlled within ±3%. Radioactive sources 133Ba and 137Cs are used to calibrate the energy resolution and E-C relationship. The characterization results show that all detector modules' energy resolutions are better than 26% at 32 keV, meeting the design specification. And their E-C relationships vary regularly with voltage. All of the characterization results indicate that the flight model of the HXI spectrometer meets the performance requirements and is capable of performing on-orbit observation activities.

show abstract

Section: Jinst 17 P05045mentioning

confidence: 99%

Pre-launch characterization of the spectrometer of Hard X-ray Imager (HXI) onboard the ASO-S mission

Liu¹,

Zhang²,

Wu³

et al. 2022

J. Inst.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Chang'e-2 was involved in the exploration of the Moon in an elliptical orbit (100 km × 15 km) different from that of Chang'e-1 (200 km) (Li et al 2010a(Li et al , 2010b. Except for the Interference Imaging Spectrometer (IIM), the other 7 onboard payloads are basically the same as those used by Chang'e-1 (Ma et al 2008(Ma et al , 2013. Chang'e-3 was China's first lunar lander-rover mission.…”

Section: Data Sourcesmentioning

confidence: 99%

China’s Lunar and Planetary Data System: Preserve and Present Reliable Chang’e Project and Tianwen-1 Scientific Data Sets

Zhang

Zeng

et al. 2021

Space Sci Rev

View full text Add to dashboard Cite

Data infrastructure systems such as the National Aeronautics and Space Administration (NASA) Planetary Data System (PDS), European Space Agency (ESA) Planetary Data Archive (PSA)and Japan Aerospace Exploration Agency (JAXA) Data Archive and Transmission System (DARTS) archive large amounts of scientific data obtained through dozens of planetary exploration missions and have made great contributions to studies of lunar and planetary science. Since China started lunar exploration activities in 2007, the Ground Research and Application System (GRAS), one of the five systems developed as part of China’s Lunar Exploration Program (CLEP) and the Planetary Exploration of China (PEC), has gradually established China’s Lunar and Planetary Data System (CLPDS), which involves the archiving, management and long-term preservation of scientific data from China’s lunar and planetary missions; additionally, data are released according to the policies established by the China National Space Administration (CNSA). The scientific data archived by the CLPDS are among the most important achievements of the CLEP and PEC and provide a resource for the international planetary science community. The system plays a key and important role in helping scientists obtain fundamental and original research results, advancing studies of lunar and planetary science in China, and improving China’s international influence in the field of lunar and planetary exploration. This paper, starting from CLEP and PEC mission planning, explains the sources, classification, format and content of the lunar and Mars exploration data archived in the CLPDS. Additionally, the system framework and core functions of the system, such as data archiving, management and release, are described. The system can be used by the international planetary science community to comprehensively understand the data obtained in the CLEP and PEC, help scientists easily access and better use the available data resources, and contribute to fundamental studies of international lunar and planetary science. Moreover, since China has not yet systematically introduced the CLPDS, through this article, international data organizations could learn about this advanced system. Therefore, opportunities for international data cooperation can be created, and the data service capability of the CLPDS can be improved, thus promoting global data sharing and application for all humankind.

show abstract

“…CE-2 GRS is the first gamma ray spectrometer that used large LaBr 3 crystal as the main detector to measure gamma rays emitted from the Moon within the energy region from 0.3-MeV to 9-MeV45. The energy resolution of the flight model is ~ 5% full width at half maximum at 662 keV, which is about two times better than LPGRS6.…”

mentioning

confidence: 99%

Potassium Map from Chang'E-2 Constraints the Impact of Crisium and Orientale Basin on the Moon

Zhu

Chang

et al. 2013

Sci Rep

View full text Add to dashboard Cite

KREEP materials were thought to be last crystallized at the lunar crust and mantle boundary. Impact cratering and volcanism are mainly responsible for their distributions on the lunar surface. Therefore, observation of global KREEP materials and investigation of distributions in the areas of large basins are of critical importance to understand the geologic history of the Moon. Here we report the new global potassium distribution on the Moon detected by Chang'E-2 Gamma-ray Spectrometer. We found that our new measurements are in general agreement with previous observation. A new finding and an important difference is that relatively higher K abundances in the Mare Crisium and Mare Orientale than their surrounding rims were detected for the first time. In light of our observations in these two areas, we propose that Crisium and Orientale basin-forming impact events may have penetrated to the lower crust and excavate the deeper materials to the lunar surface.

show abstract

Gamma-ray spectrometer onboard Chang'E-2

Cited by 15 publications

References 5 publications

Pre-launch characterization of the spectrometer of Hard X-ray Imager (HXI) onboard the ASO-S mission

Pre-launch characterization of the spectrometer of Hard X-ray Imager (HXI) onboard the ASO-S mission

China’s Lunar and Planetary Data System: Preserve and Present Reliable Chang’e Project and Tianwen-1 Scientific Data Sets

Potassium Map from Chang'E-2 Constraints the Impact of Crisium and Orientale Basin on the Moon

Contact Info

Product

Resources

About