The energy resolution obtained from this detector is better than a silicon detector when using ion beams heavier than helium ions. There are various designs of ionization detectors but a general schematic of the detector consists of a transversal field ionization chamber with a Frisch grid positioned between anode and cathode electrodes. The anode is subdivided into two plates separated by a specific distance. From the anode, signals "∆E"(energy lost), "Erest"(residual energy after loss), and "Etot" (the total energy "Etot= ΔΕ+Erest)" as well as the atomic number "Z" can be deduced. For this specific design, the gas used was isobutane at pressures of 20-90 mbar with a flow rate that was electronically controlled, the previous figure. A polypropylene foil was used as the entrance window. It has to be noted that the foil thickness homogeneity is of more importance for the detector energy resolution than the absolute thickness. If heavy ions are used and detected, the effect of energy loss straggling will be easily surpassed by the energy loss variation, which is a direct consequence of different foil thicknesses. The cathode electrode is divided in two insulated halves, thus information of particle entrance position is derived from charges induced at the right and left halves.