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

T. E. Walker; D. R. Smith

doi:10.1117/12.926983

25 September 2012 The effects of radiation damage on the spectral resolution of the Chandrayaan-1 x-ray spectrometer over the full mission duration

T. E. Walker, D. R. Smith

Author Affiliations +

Proceedings Volume 8453, High Energy, Optical, and Infrared Detectors for Astronomy V; 845332 (2012) https://doi.org/10.1117/12.926983
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

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-ray detectors providing a total collecting area of ~24 cm^2, corresponding to a 14° field of view (FWHM), with the ability to measure X-rays from 0.8 – 10 keV. During the 10 months the spacecraft was located in orbit around the Moon a number of solar flare X-ray events were detected, along with calibration data from X-ray sources housed inside the movable door of the instrument. This paper presents a further study of the degradation in spectral resolution of the measured X-ray calibration lines, adding a final calibration point towards the end of mission lifetime to the known results from the midpoint of the mission, giving a more detailed analysis of the extent of the radiation damage. The radiation environment the detectors were subjected to is discussed in light of the actual radiation damage effects on the spectral resolution observed in flight.

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T. E. Walker and D. R. Smith "The effects of radiation damage on the spectral resolution of the Chandrayaan-1 x-ray spectrometer over the full mission duration", Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 845332 (25 September 2012); https://doi.org/10.1117/12.926983

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KEYWORDS

Sensors

Calibration

X-rays

Radiation effects

X-ray detectors

Data conversion

Spectral resolution

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