Realization and test of position sensitive boron coated straw-tube

To deal with the shortage of ³He gas, which is widely used in thermal neutron detection, the boron coated straw-tubes have been developing to replace the ³He proportional counters. We present in this paper the realization process of a straw tube with 1 m long and the diameter is 4 mm, with 1 μm B₄C layer coated on the inner surface to convert neutrons to charged particles.^[1] The parameters, high voltage, working gas and the diameter of the anode wire, are researched to realize the best performance of the straw tube. 7.27 mm, the average position resolution of a single tube, is achieved with the straw tube with 15 μm-diameter karma anode wire (1.33μΩ · m at 20°C), with 1atm pure argon as working gas and working under the voltage of 730 V in the tentative experimental research. The linearity of positions measured by charged division read out and the real positions can achieve 99.992%.