Abstract：The ionization chamber is widely used for the dosimetric measurement on the protection level dose rate in nuclear facilities, radiation therapy, and environmental monitoring. In order to improve the domestic manufacturing level of the ionization chamber, the cavity ionization chamber was studied. The thickness of the ionization chamber wall and the design of the guard electrode were studied by the method of theoretical analysis and Monte Carlo simulation. The designed cavity ionization chamber was tested in the standard X and γ radiation field to evaluate the dosimetry characteristic. The results showed that the leakage current was less than ±5fA, and the work voltage of the cavity ionization chamber was 200~800V. The energy response was tested in the N60~N250 X radiation field and the 137Cs, 60Co γ radiation filed. When the dose rate is normalized to 60Co radiation field, the energy response was better than ±5%. The long-term stability and the angular response of the ionization chamber in half a year was better than 0.5%. At last, it can realize the measurement of dose rate of 3mGy/h~30Gy/h with the relative deviation for the agreed dose rate better than ±5%.
刘川凤,成建波,李德红,程金星,黄建微,张晓乐,张健,张璇,李月,郝光辉. 48keV~1.25MeV X/γ射线空腔电离室研制及性能测试[J]. 计量学报, 2023, 44(12): 1889-1896.
LIU Chuan-feng,CHENG Jian-bo,LI De-hong,CHENG Jin-xing,HUANG Jian-wei,ZHANG Xiao-le,ZHANG Jian,ZHANG Xuan,LI Yue,HAO Guang-hui. Design and Performance Study of the Cavity Ionization Chamber Used in X/γ Radiation Field of 48keV~1.25MeV. Acta Metrologica Sinica, 2023, 44(12): 1889-1896.
Li J Y, Guo W, Hou J B, et al. 60Co and 137Cs Gamma Ray Reference Radiation Field And the Standard Cavity Ionization Chambers Used for Air Kerma Determination［J］. Radiation Protection, 1996,16 (2): 88-97.
Liu S L, Jiang P H, Liang C Z, et al. Study of a standard measuring device for 60Co gamma-ray exposure at radiation protection level ［J］. Radiation Protection, 1985,5 (5):321-330.
Li D H, Wang P W, Wu M M, et al. Construction on Graphite Cavity Ionization Chamber as Air Kerma Primary Standard for 137Cs γ Rays ［J］. Acta Metrologica Sinica, 2016,37 (3): 323-327.
Teng Z B, Song M Z, Ni N, et al.A Study of the Differences in Energy Response Characteristics of High Pressure Ionization Chamber Obtained by Different Monte-Carlo Codes［J］. Nuclear Electronics & Detection Technology,2019, 39 (1): 95-100.
Qu B B, Wu J J, Lu P Z, et al. Calibration and Uncertainty Analysisi of Protective Level X-ray Ionization Chamer ［J］. Acta Metrologica Sinica, 2022, 43 (8): 1095-1102.
Ulrike Ankerhold. Catalogue of X-ray spectra and their characteristic data ISO and DIN radiation qualities, therapy and diagnostic radiation qualities, unfiltered X-ray spectra ［M］. Braunschweig: Physikalisch-Technische Bundesanstalt Braunschweig, 2000.
Wang P W, Zheng W N. Free Air Ionization Chamber for the Absolute Measurement of Synchrotron Radiation X-ray Fluence［J］. Acta Metrologica Sinica, 2020, 41(10): 1303-1307.
Teng Z B, Song M Z, Wang H Y, et al. The Monte Carlo Modeling and Experimental Verification of the 90Sr/90Y Source and the Extrapolation Chamber［J］. Acta Metrologica Sinica, 2022, 43(11): 1512-1517.
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The International Organization for Standardization Technical Committees. ISO 4037-1 Radiological protection-X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy-Part 1: Radiation characteristics and production methods ［S］.2019.
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