Long-term stability test of a triple GEM detector
  The main aim of the study is to perform the long-term stability test of gain of the single mask triple GEM detector. A simple method is used for this long- term stability test using a radioactive X-ray source with high activity. The test is continued till accumulation of charge per unit area > 12.0 mC/mm2. The details of the chamber fabrication, the test set-up, the method of measurement and the test results are presented in this paper. 
R. P. Adak, S. Biswas, S. Das, D. Ghosal, S. K. Ghosh, A. Mondal, D.   Nag, T. K. Nayak, R. N. Patra, S. K Prasad, S. Raha, ...
physics.ins-det hep-ex