Abstract
The valuable properties of CVD diamond films used as micro-strip gas chamber (MSGC) substrate are presented and a gas detector with an area of 20x20mm<sup>2</sup> was fabricated on a CVD diamond film whose resistivity ranges between 10<sup>10</sup> and 10<sup>11</sup>Ω-cm. We systematically report the energy spectra generated by a 5.9keV<sup>55</sup>Fe X-ray source. The effects of high potential on the energy resolution are investigated and discussed in detail. A better energy resolution about 12.2% is obtained when MSGC filling with an argon+10%CH<sub>4</sub> gas mixture operated at a drift potential of -1100V and a cathode voltage of -650V.
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