On April 8, the journal Nature published the latest research results of the observation data of the Chang'e-2 gamma spectrometer at the Purple Mountain Observatory of the Chinese Academy of Sciences. The study used Chang'e-2 gamma spectrometer to observe the content of radioactive elements in the large impact crater on the lunar surface and its surrounding sputters, and put forward some scientific speculations about the geological phenomena of lunar surface impact events that occurred during the evolution of the moon.
In the Chang'e-2 project, the Key Laboratory of Dark Matter and Space Astronomy of the Chinese Academy of Sciences undertook the development and data analysis of the gamma spectrometer. Compared with Chang'e-1, Chang'e-2's gamma spectrometer is the first in the world to use advanced bromide scintillation crystal as the main detector, and cesium iodide (CsI) as an anti-coincidence crystal to successfully suppress the space and satellite background. The sensitivity of the Chang'e-2 gamma spectrometer is much higher than that of similar detectors in the world. It can sensitively distinguish the nuances of the lunar surface elements and provide a solid foundation for later data analysis and scientific research.
At present, there is considerable controversy internationally about the impact depth when the lunar surface basin was formed. For example, the new detection results of the Chang'e-2 gamma spectrometer confirmed that the materials surrounding the moon-risk basin are rich in radioactive elements, but the abundance is low. This shows that the impact when the Weihai Basin was formed only intruded into the lunar crust rock layer, not the scientific community had speculated that it had already hit the deep part of the moon.
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