Determination and Evaluation of Dosimetric Parameters of Domestic Parallel Plate Ionization Chamber

LI Yihua; LU Gang; WANG Kun; WANG Zhipeng; JIN Sunjun; LIU Yijing

doi:10.12338/j.issn.2096-9015.2024.0052

Volume 68 Issue 5

May 2024

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Article Navigation > Metrology Science and Technology > 2024 > 68(5): 17-23

LI Yihua, LU Gang, WANG Kun, WANG Zhipeng, JIN Sunjun, LIU Yijing. Determination and Evaluation of Dosimetric Parameters of Domestic Parallel Plate Ionization Chamber[J]. Metrology Science and Technology, 2024, 68(5): 17-23. doi: 10.12338/j.issn.2096-9015.2024.0052

Citation:

LI Yihua, LU Gang, WANG Kun, WANG Zhipeng, JIN Sunjun, LIU Yijing. Determination and Evaluation of Dosimetric Parameters of Domestic Parallel Plate Ionization Chamber[J]. Metrology Science and Technology, 2024, 68(5): 17-23. doi: 10.12338/j.issn.2096-9015.2024.0052

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Determination and Evaluation of Dosimetric Parameters of Domestic Parallel Plate Ionization Chamber

doi: 10.12338/j.issn.2096-9015.2024.0052

LI Yihua^1
,,
LU Gang^{1, 2},
WANG Kun²,
WANG Zhipeng^{2
,
,},
JIN Sunjun²,
LIU Yijing³

1.
Anhui University of Science and Technology, Huainan 232001, China
2.
National Institute of Metrology, Beijing 100029, China
3.
Beijing Pulinkang Technology Co., Ltd, Beijing 102206, China

Received Date: 2024-02-26
Accepted Date: 2024-04-01
Rev Recd Date: 2024-04-11

Available Online: 2024-05-17

Publish Date: 2024-05-18

Abstract

Abstract

As a high-sensitivity radiation detector, ionization chambers play an important role in radiotherapy dose calibration and radiation environment monitoring. However, the field of radiotherapy dose measurement is highly dependent on imported equipment, and there is a lack of systematic experimental data supporting the dose stability and reliability of domestic detectors. This study focuses on the domestic QPPC40 parallel plate ionization chamber, quantitatively measuring its key dosimetric parameters in medical accelerator beams. These parameters include energy response, ion recombination, polarity effect, repeatability, leakage current, and dose linearity. The goal is to enhance the dosimetric performance of domestic detectors and provide practical recommendations for clinical applications. The measurement results indicate that the energy response correction factor k_Q for 6 ～ 25 MV photon beam relative to Co-60 γ ray ranges from 0.991 to 0.961, with a repeatability of 0.02%. For 4 ～ 22 MeV electron beams, the k_Q factor ranges from 0.953 to 0.887. At an operating voltage of -400 V, the ion recombination correction values for dose rates of 0.04-5.13 Gy/min range from 1.002 to 1.008. The polarization correction factor is 1.001, and the leakage current is within ±0.05%. The tested indicators generally meet the technical requirements of the JJG 912-2010 verification regulation for therapeutic level ionization chambers. However, the calibration coefficients and energy response consistency of ionization chambers from the same batch show some variability. It is recommended to conduct interim inspections during use and to monitor the long-term stability of the water-absorbed dose calibration coefficient and energy response of the detector.
- metrology,
- radiation dose,
- parallel plate ionization chamber,
- energy response,
- absorbed dose to water,
- measurement

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References(37)

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