Abstract: DSRI will provide a set of four imaging proportional counters for the Danish-Soviet x-ray telescopes XSPECT/SODART. The sensor principle is based on the novel micro-strip proportional counter (MSPC), where the strip electrodes are deposited by photolithography onto a rigid substrate. The MSPC offers many advantages: a uniform gas gain, an excellent energy resolution, the possibility to match the strip pitch to the desired positron resolution, a fast charge collection, and low operating voltages. However, a stable behavior of the MSPC requires a careful choice of both substrate and strip electrode material. The low energy detectors are equipped with polyimide windows of 0.5 $mu@m thickness, providing a high quantum efficiency even at 200 eV with an energy resolution comparable to that of solid state detectors. The MSPC is capable of operating at high counting rates (10$+5$/ ph s$+$MIN1$/) and the electronics are designed to match this capability. !10
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