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Varadis RADFETs provide critical data on Rosetta Space Mission


On its more than 10 years journey to comet 67P/Churyumov–Gerasimenko, Rosetta carried RadFET ionising dose monitors in the central electronics of the orbiter instrument COSIMA and the lander instrument SESAME. The readings of the dosimeters were corrected for the temperature of the devices during measurements. Because the sensitivity of RadFETs depends on the energy of impinging charged particles, a mean efficiency  factor for the prevalent proton radiation was determined by applying nine efficiency models to proton energy spectra of Rosetta’s radiation environment.


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