V. Low pressure gas detectors 42 Α. Parallel plate avalanche chambers 42 Β. Low pressure multiwire proportional counters 45 C. Low pressure multi-step detectors 45 VI. Gas microstrip detectors 46 A. Description 46 B. Influence of the substrate and nature of electrodes 48 C. Performances 49 VII. Conclusion 51 References 52 Unauthenticated Download Date | 6/13/16 9:24 AM Gas Filled Detectors 13number of primary pairs. In the absence of other effects, ions will rapidly lose their energy by multiple collisions with gas molecules while electrons will diffuse in the medium.