A new structure design and the basic radiation characteristics test of the intense current tube

• Published in: IOP conference series. Earth and environmental science Vol. 121; no. 5; pp. 52046 - 52052
• Main Authors: Li, Zhiyuan, Ai, Xianyun, Fu, Li, Cui, Hui
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.02.2018
• Subjects: Anodes; Cathodes; Circuits; Dosage; Electric fields; Optimization; Radiation
• ISSN: 1755-1307; 1755-1315; 1755-1315
• DOI: 10.1088/1755-1315/121/5/052046

As a kind of special G-M counter, the intense current tube (ICT) is characterized by small ratio of cathode to anode radius, high working current or count rate, and can be used as the detection units of ultra-high range radiation instruments. In this paper, a new design of ICT structure is introduced, not only does it have a minimum ratio of cathode to anode but it also has a cathode which directly sticks out from the sensitive gas. Using COMSOL Multiphysics, we simulated the electric field between the anode and cathode and finalized the optimal structure. The results of processes and experiments show that the structure has better properties, with plateau slope reaching up to 7.4% within 100V, and it also has a wider range of dose rate. The linear data between the bottom limit of 0.2mGy/h and the upper limit of 1Gy/h is quite accurate but it becomes less reliable beyond 1Gy/h. By using Paralyzable model, we deduce that the dead time of the said ICT is less than 13.4 µs, and we will further optimize the readout circuit in order to reduce the resolution time of the circuit in the near future.