การพัฒนาหัววัดรังสีพรอพอร์ชันแนลที่มีแอโนดรูปแบบใหม่ / จีรยุทธ ธำรงพุทธิกุล = Development of a proportional counter with new anode configuration / Jeerayutt Thumrongputtikun
Three configurations gas flow proportional counter were developed i.e. side-window, end-window with parallel anode-cathode and end-window with perpendicular anode-cathode. The local materials were mainly used to fabricate the detector parts. A 23.4 mm inside diameter of 304 stainless steel pipe was employed for cathode structure of side-window and end-window with parallel anode-cathode, while a 50 mm inside diameter with 30 mm height cup shaped stainless steel was selected for end-window with perpendicular anode-cathode. The 30 micrometre and 100 micrometre diameter gold-plated tungsten anode wires were comparatively studied. The 25 micrometre thickness aluminized-polypropylene film was used for detector window. The P-10 detector gas with a set of gas flow regulator was applied for testing developed detector. It was found that at the P-10 flow rate of 20 ml/min, the plateau length of the side-window, end-window with parallel and perpendicular anode-cathode structures were 1800-2200 V, 1200-1700 V and 1800-2200 V and the energy resolution for x-ray 5.9 keV Fe-55 of those detector were 16.8%, 19.1%, and 34%, respectively. Besides, the range of x-ray energy at 30 keV down to UVC region could be detected with the energy linearity of R[superscript 2] = 0.9999
