Physics Research International / 2012 / Article / Fig 6

Research Article

A New Technology for Fast Two-Dimensional Detection of Proton Therapy Beams

Figure 6

An example of calibration pulse height distribution from the Fe calibration source embedded in the Micromegas chamber with mesh at −590 V. The pulse height is strongly dependent on the mesh potential, and somewhat dependent on the ambient temperature and pressure. The position of the main peak is used as a daily gain calibration for the Micromegas. The smaller peak is the Argon escape peak.