V

Figure 6.2. Proportional counter. (a) The incident x ray penetrates the thin window and ejects a photoelectron from an argon atom. Secondary electrons may also carry some of the energy. The electrons travel about 1 mm or less and create ion pairs (electrons and positive ions) along their tracks. One such track is shown as the short dark line. The electrons are attracted to the anode, near which they multiply by ionizing other argon atoms. (b) Position-sensitive proportional counter. The anode is resistive and the deposited charge is fed to preamplifiers at each end. The ratio of detected voltages yields the position along the wire of the deposited charge. The anode may be kept at ground potential to avoid large high-voltage capacitors, e.g., C1 in (a); in this case the body is run at high negative voltage (don't touch!).

Signal 2

Amp 2

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