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A novel proportional counter made of a capillary plate

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7 Author(s)
Tamura, T. ; Dept. of Phys., Yamagata Univ., Japan ; Sakurai, H. ; Noma, M. ; Gunji, S.
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A new type of proportional counter utilizing a capillary plate with the capability of fine position resolution and high gas gain has been developed. It consists of a bundle of fine glass capillaries with electrodes on both the inlet and the outlet. The capillaries are 100 μm in diameter and 800 μm in length, and gas multiplication was found to occur in each capillary with an applied voltage between the inlet and the outlet. The proportional counter was found to operate up to a gain of 104 at gas pressures of 1, 0.75 and 0.5 atm. The energy resolution for 1 atm was 20.8% for 5.9 keV X-rays at a gas gain of 4000. The detection efficiency was comparable to a conventional single wire proportional counter. The dependences of energy resolution on the drift and applied voltage to the capillary plate are investigated and discussed, using calculated electric fields for the drift and capillary regions

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Nuclear Science, IEEE Transactions on  (Volume:43 ,  Issue: 3 )