Mr. Zhongbin Hang Profile

Zhongbin Hang

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Proceedings Article | 8 April 2024 Paper

The redefinition of operational quantities and its impact on external radiation monitoring

Qiao Li, Zhongbin Hang, Minghan Jia, Mingzhe Song

Proceedings Volume 13090, 130900R (2024) https://doi.org/10.1117/12.3025811

KEYWORDS: Equipment, Dosimetry, Skin, Particles, Tissues, Ionizing radiation, Eye, Standards development, Calibration, Radiation injury

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This paper explores the redefinition of operational quantities in radiation protection, analyzing their impact on external radiation monitoring. It delves into the limitations of current operational quantities defined by ICRU Report 39, such as their inability to accurately measure certain types of radiation and energy levels. The new definitions proposed in ICRU Report 95 are discussed, focusing on how they offer a more accurate representation of radiation risks and improve the effectiveness of radiation monitoring instruments. The paper also examines the future development of operational quantities, suggesting individual customization and the application of machine learning for optimization. The redefined operational quantities aim to enhance radiation protection by providing more precise and practical measures for various radiation types and environments.

Proceedings Article | 8 April 2024 Paper

Performance testing of a fully automated extrapolation ionization chamber with adjustable collection electrodes

Minghan Jia, Zhongbin Hang, Qiao Li, Mingzhe Song

Proceedings Volume 13090, 130900T (2024) https://doi.org/10.1117/12.3026176

KEYWORDS: Ionization, Vacuum chambers, Electrodes, Ions, Krypton, Capacitance, Tunable filters, Standards development, Ionizing radiation, Ion irradiation

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The China Atomic Energy Research Institute (CIAE) has designed a fully automated extrapolation ionization chamber with variable collection area. Compared with the traditional type of extrapolation ionization chamber, it has the advantages of variable collection area, and the adjustment of the depth of the ionization chamber can be accomplished through the control system, and it can cope with the measurement requirements of different sizes of radioactive sources by providing an adjustable and selectable mode of four sizes of collection electrodes, and the fully automated measurement system is beneficial to reduce the measurement error of reference absorbed dose and improve the efficiency and accuracy of measurement results. The fully automated measurement system helps to minimize the measurement error of the reference absorbed dose and improve the efficiency and accuracy of the measurement results. In this paper, the performance parameters such as leakage current, saturation curve, ion collection efficiency, extrapolation curve, and effective collection area of this extrapolation chamber are investigated to evaluate its feasibility in β-ray dosimetry. Through experimental measurements, the leakage current of the ionization chamber is in the range of 4.2 fA~7.7 fA, which is smaller than the specified 12 fA, the ion collection efficiency is greater than 0.9999, the slopes of the extrapolation curves are 0.6417 and 1.3167 for the irradiation of the two radioactive sources, ⁹⁰Sr/⁹⁰Y and ⁸⁵Kr, which are additionally with beam flattening filters 10 cm from the source, respectively, and the effective collection areas of the four collection poles are 28.35132 cm² , respectively. The experiments show that the performance of this new type of extrapolation ionization chamber is qualified, and its feasibility in β-ray dosimetry is verified.

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