Abstract
Commercially available carbon fiber was used as a new resistive anode wire for a charge division type position sensitive proportional counter. It has a small diameter of 7 μm and a large electrical resistance of about 4 kΩ/cm and is available at a very low cost. Although about 3, 000 fibers are weakly sticked together in a bundle with a kind of adhesives, a single fiber can easily be taken out from the bundle after the dissolution of the adhesives by acetone. Because of the smaller diameter compared with conventional anode wires, the lower high voltage serves the purpose. However, in the same reason, the saturation of gas multiplication appeared and hence an energy linearity tended to be lost, which was not much trouble for position detectors. Electrical resistance was uniform throughout all the length, which resulted in a small standard deviation of ±0.35% in the position linearity for a length of 20 cm. The relative position resolution for collimated Mn KX-rays was 0.47% in FWHM.
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