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Improved design and construction of an ionization chamber for the CSNS beam loss monitor (BLM)

Chinese Physics C 2012年第4期36卷 329-333页

作者：田建民徐美杭赵中亮陈昌阮向东陈元柏徐韬光陆双桐 State Key Laboratory of Technologies of Nuclear Detection and Electronics Institute of High Energy Physics Chinese Academy of Sciences Physics Science and Engineering Technology Department Guangxi University Beijing Nuclear Instrument Factory China National Nuclear Corporation

Based on the first ionization chamber （IC） prototype, the structure, working gas component and electrode material of the IC are improved. The test of the improved IC shows that the plateau length is about 2000 V, the plateau slope is less than 0.2%/100 V, the sensitivity is 19.6 pA/rad·h 1, the up-limitation of the linearity can be up to 3.6×105 rad/h, and the applied voltage can be operated to 3500 V. The test results show that the performance of the improved IC meets the requirements of the beam loss monitor.

关键词： CSNS BLM detector ionization chamber plateau curve

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Design and construction of the first prototype ionization chamber for CSNS and PA beam loss monitor (BLM) system

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Chinese Physics C 2009年第2期33卷 123-126页

作者：徐美杭田建民陈昌陈元柏徐韬光陆双桐 Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Physics Science and Engineering Technology Department Guangxi University China National Nuclear Corporation Beijing Nuclear Instrument Factory

Design and construction of the first prototype ionization chamber for CSNS and Proton Accelerator （PA） beam loss monitor （BLM） system is reported. The low leakage current （〈0.1 pA）, good plateau （≈800 V） and linearity range up to 200 Roentgen/h are obtained in the first prototype. All of these give us good experience for further improving the ionization chamber construction.

关键词： spallation neutron source proton accelerator beam loss monitor ionization chamber plateau curve linearity

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LARGE　VOLUME　ionization　chamber　USED　AS　LABORATORY　REFERENCE　FOR　LOW　ENERGY　X－RAY　MEASUREMENT

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Nuclear Science and Techniques 1994年第3期5卷 166-169页

作者：杨国山薛永库蔡反攻 Inst of Radiation Medicine Beijing China

A large volume spherical ionization chamber of 195 mm diameter and 0.36 mg/cm2wall thickness made from conducting carbon-fibre epoxy composite material has been developed. The mechanical intensity of the chamber is satisfactory for a good longterm volume stability. Owing to its large volume and thin wall, the chamber is sensitive to low energy photon beams and has excellent energy-response characteristics. This ionization chamber is suitable not only for a laboratory reference but also for measurement of low energy photon beam exposure rates at protection-level.

关键词： Low energy X-rays ionization chamber Carbon-fibre

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Design of the front-end electronics for parallel plate ion chamber

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Radiation Detection Technology and Methods 2021年第4期5卷 558-563页

作者： Peng Huang Zhi-Guo Yin Xue-Er Mu Yang Wang Xiao-Tong Lu Tian-Jue Zhang Beijing China

Background A set of nozzle systems for proton therapy is now being developed at China Institute of Atomic *** real-ize the measurement of beam dose,a set of charge measurement electronics is designed,which is used to measure the output charge signal of the ionization chamber integration ***,the charge measurement device can be used to measure the position information of ion chamber strips just by changing certain *** The device realizes the integration and amplification of charge by IVC102,a precise low-noise integrator,and the DSP controls the ADC to collect and process the *** communication protocol is used to realize communication with the host computer which makes it possible to read data and set the *** A fixed charge generator is designed to generate 20 pC to 2 nC charge,which is used to test the measuring accuracy of *** results have shown that the accuracy is within 0.62%in the above charge *** After experimental tests,the front-end electronics meet the design goal and play a certain pre-test and verification role in the dose and beam position monitoring in the proton therapy system.

关键词： Proton therapy ionization chamber Dose monitoring Charge measurement

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On Quality Evaluation and Analysis of Metrological Verification and Detection

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Journal of Environmental Science and Engineering(B) 2022年第1期11卷 24-30页

作者： Meng Xiaobo Binzhou Inspection and Testing Center Binzhou 256603ShandongChina

With the rapid development of China’s economy and society,under the existing economic system,measurement work is of great significance to promote market development and improve people’s living *** quality evaluation of testing work is an important means to ensure the accuracy of *** on the analysis of several factors affecting the quality of measurement work,this paper takes the ionizing radiation monitoring quality as an example,and makes a concrete exposition on the evaluation and analysis of the quality of metrological verification work.

关键词： Metrological verification test the quality of work measuring instruments ionization chamber

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Dosimetric Characteristics of 6 MV Medical Linac at BAEC

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2021年第1期10卷 38-46页

作者： Sudeb Kumar Roy Pretam Kumar Das Rajada Khatun Md. Ashikur Rahman Shirin Akter Tushar Kumar Mohammad Monjur Ahasan Department of Physics Pabna University of Science and Technology Pabna Bangladesh Medical Physics Division Atomic Energy Centre Dhaka Bangladesh Institutes of Nuclear Medical Physics Atomic Energy Research Establishment Savar Dhaka Bangladesh

Dosimetric characteristic is one of the essential parameters of a medical linear accelerator (LINAC), which must be obtained before clinical use. The dosimetric characteristics for 6 MV photon beam were measured and compared with the corresponding published data. The study was done using a Varian linear accelerator (Model Clinac-iX) at the Institute of Nuclear Medical Physics (INMP), AERE, Savar, Dhaka, under the Bangladesh Atomic Energy Commission (BAEC). The data is taken for 10 field sizes (2 × 2, 3 × 3, 5 × 5, 7 × 7, 10 × 10, 15 × 15, 20 × 20, 25 × 25, 30 × 30 and 40 × 40 cm2) at same conditions. The measured Percent Depth Dose (PDD) curves were obtained for 6 MV photon beams with the field as mentioned above and compared with the calculated PDD curves. The measured depth dose (Dmax) for reference field size (FS) 10 × 10 cm2 is 15.99 mm, and the PDD at 10 cm depth (D10) is 66.87% for 6 MV photon energies that are found to be compatible with the published report BJR supplement 25. The measured PDD curves for photon energies show a good agreement with the standard PDD curves. The photon beam dosimetry data found in the current study are compatible and all the tolerances are within the clinically acceptable tolerance limit.

关键词： Linac Machines 3D Water Phantom ionization chamber Electrometer

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Development of Rn/Tn Compensated Gas Monitors for β Nuclides

Development of Rn/Tn Compensated Gas Monitors for β Nuclide...

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The Second Asian and Oceanic Congress for Radiation Protection

作者： S. Matsubara Y.Ota T.Goto ALOKA Co. LTD. 6-22-1MureMitaka-shiTokyo181-8622Japan ALOKA Co. LTD. 6-22-1MureMitaka-shiTokyo181-8622Japan

A circuit was devised for removing the influence of Rn and Tn on an ionization chamber gas monitor for β rays. The circuit subtracted the current due to Rn and Tn from the gross current. A monitor installed the circuit canceled the concentration variation of Rn and Tn caused by ventilation condition. The background level of the gas monitor compensated the influence of Rn and Tn was reduced by 10%. The minimum detectable concentrations of the compensated monitor were lower than the legal concentration limits in exhaust gas of 8 radioisotopes used in life science research and nuclear medicine: 3H, 14C, 24Na, 51Cr, 67Ga, 75Se, , 89Sr, 99mTc, and 3 main radioisotopes discharged from the nuclear power plants: 85Kr , 41Ar and 133Xe.

关键词： Rn Tn gas monitor ionization chamber ventilation alpha particle exhaust gas

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