An instrument for measuring the radiation dose (RADOM), proposed by T Dachev of the Bulgarian Academy of Sciences has been included in the Chandrayaan-1 payloads. RADOM consists of a semiconductor detector which measures the incident particle flux (ions, electrons and gamma rays) due to solar and galactic cosmic rays, accumulated absorbed dose rate and the deposited energy spectrum. The Si detector with an area of 2 cm2 has a charge sensitive preamplifier and a multichannel analyzer. Its threshold level is 8 keV. It will make the measurement in the lunar environment as a function of altitude as the spacecraft descends from the lunar capture orbit to its final altitude of 100 km.
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