Study of the energy resolution by analyzing the pulse shape from the gas proportional counter

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The basic priciple for the X-ray detection id the same both to the gas proportional counter and to the solid state detector. The former has electron avalanche process while the latter has not. Therefore, the behavior of the primary electron cloud can be easily studied in the solid state detector. We studied the signal shape of the solid state detector and found the electron cloud loss through the absorption at the entrance window as well as the non-linearity at the Si-K edge energy. We obtained the detailed understanding of the behavior of the primary electron cloud. The detailed study of the pulse shape from the gas proportional counter revealed that the pulse shape depends on the X-ray polarization. This is quite an unexpected result. The gas proportional counter surely functions as an X-ray polarimeter by employing the detailed study of the pulse shape. We got a template of the X-ray pulse shape by summing up many X-ray induced signals. Our new approach is to extract the energy information by comparing the template with the unknown pulse. This surely enables us to get more information on the incident X-ray than that used in the conventional method which only measures the maximum pulse height. We got the energy resolution of 17.0% which is statistically equal to that of 17.4% by using the conventional method. The gas avalancheinside the gas proportional counter improves the signal to noise ratio so that an extra technique does not needed.