The effects of radiation damage on the spectral resolution of the Chandrayaan-1 x-ray spectrometer over the full mission duration

摘要

The Chandrayaan-1 X-ray Spectrometer (C1XS) was launched onboard the Indian Space Research Organisation (ISRO)Chandrayaan-1 lunar mission in October 2008. The instrument consisted of 24 swept-charge device silicon X-raydetectors providing a total collecting area of ~24 cmsup2,/sup corresponding to a 14° field of view (FWHM), with the ability tomeasure X-rays from 0.8 – 10 keV. During the 10 months the spacecraft was located in orbit around the Moon a numberof solar flare X-ray events were detected, along with calibration data from X-ray sources housed inside the movable doorof the instrument. This paper presents a further study of the degradation in spectral resolution of the measured X-raycalibration lines, adding a final calibration point towards the end of mission lifetime to the known results from themidpoint of the mission, giving a more detailed analysis of the extent of the radiation damage. The radiation environmentthe detectors were subjected to is discussed in light of the actual radiation damage effects on the spectral resolutionobserved in flight.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.