Chandrayaan-1 has 11 payloads on board. Five of them are indigenous and remaining six are from other nations being carried free of cost. One among them is Chandrayaan-1 x-ray spectrometer (C1XS) realised primarily through ESA funds with partial support from ISRO. The hardware has been developed at the Rutherford Appleton Laboratory, UK in collaboration with the ISRO Satellite Centre, Bangalore. The primary goal of the C1XS instrument is to carry out high quality X-ray spectroscopic mapping of the Moon, in order to find solutions to key questions on the origin and evolution of the Moon. C1XS will use X-ray fluorescence spectrometry (1.0-10 keV) to measure the elemental abundance, and map the distribution, of the three main rock forming elements: Mg, Al and Si. During periods of enhanced solar activity (solar flares) events, it may be possible to determine the abundance of minor elements such as Ca, Ti and Fe on the surface of the Moon.
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