Experimental Measurement and Monte Carlo Simulation the Correction Factor for the Medium-Energy X-ray Free-air Ionization Chamber

Yu, Jili; Wu, Jian; Liao, Zhenyu; Zhou, Zhenjie

doi:10.3938/jkps.73.1466

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The Monte Carlo method is used for the calculation of k eloss , k sc , k diasc , and k diatr [4,5]. For the other correction factors (k d and k h ), the Bureau International des Poids et Measures (BIPM) reference values are applied to our standard [1]. The recommendations of the ICRU 90 report is used to calculate the correction factor for k ii and k w [6].…”

Section: Air Kerma Definitionmentioning

confidence: 99%

“…Then, the chamber was located at the reference point and transposed by distance d. Next, the ionizing current was measured at each distance. The attenuation coefficients are evaluated by [1]…”

Section: Air Attenuation Correction Factor (K a )mentioning

confidence: 99%

“…Nevertheless, the chamber is designed as low as possible to cause field distortions. Thus, the correction factor was determined as 1 with 0.07% type-B uncertainty (evaluated by the Korea Research Institute of Standards and Science) [1,5,13].…”

Section: Humidity and Field Distortion (K H And K D )mentioning

confidence: 99%

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Development of the primary standard for low-energy and W/Mo mammography x-rays at OAP, Thailand

Rindhatayathon¹,

Koonkana²,

Pungkun³

2021

Metrologia

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Free-air ionization chambers (FAC) are accepted as the primary standard of x-ray dosimetry. The low-energy x-rays are important for basic beam quantities of diagnostics at the mammography level. This research explains the FAC characteristics of the Office of Atoms for Peace (OAP) that was developed by cooperation between the OAP, Thailand, and the Korea Research Institute of Standards and Science, Republic of Korea. The applied correction factors that are necessary for determination of the air kerma rate were investigated using an experimental method and Monte Carlo simulation methods with their uncertainties. The beam characteristics, computed using the Monte Carlo method and demonstrated in this paper, are important for calculation of the correction factors. Finally, the correction factors and uncertainties of the standard beam qualities, which are recommended by the Consultative Committee for Ionizing Radiation, and W/Mo beam qualities are shown in this paper.

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Section: Air Kerma Definitionmentioning

confidence: 99%

Section: Air Attenuation Correction Factor (K a )mentioning

confidence: 99%

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Development of the primary standard for low-energy and W/Mo mammography x-rays at OAP, Thailand

Rindhatayathon¹,

Koonkana²,

Pungkun³

2021

Metrologia

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Development of the Primary Standard for IAEA TRS-457 at OAP, Thailand

Rindhatayathon

Koonkana

Rungseesumran³

et al. 2022

MAPAN

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Calibration Method and Absolute Measurements of Air Kerma of Diagnostic X-Ray Reference Qualities Using a Free-Air Ionisation Chamber

Zhao

Yan

et al. 2021

Radiation Protection Dosimetry

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Accurate dose measurement is very important for diagnosing X-ray equipment. These equipment should be traced directly or indirectly to primary standard with as little uncertainty as possible. A parallel-plate free-air chamber was designed to measure air kerma of diagnostic X-ray absolutely. Different thickness of aluminium filters were used to obtain different radiation qualities according with IEC 61267. Correction factors were obtained by experiments and simulation, especially the air attenuation factor measured with vacuum method. The relative standard uncertainty of air kerma rate measurement was 0.46% and calibration factor was 0.53%. A transfer ionisation chamber was calibrated with Radiation Qualities in Radiation beams (RQR) qualities in National Research Council of Canada and National Institute of Metrology (NIM), the differences of calibration factors are less than 0.68%.

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Experimental Measurement and Monte Carlo Simulation the Correction Factor for the Medium-Energy X-ray Free-air Ionization Chamber

Cited by 3 publications

References 4 publications

Development of the primary standard for low-energy and W/Mo mammography x-rays at OAP, Thailand

Development of the primary standard for low-energy and W/Mo mammography x-rays at OAP, Thailand

Development of the Primary Standard for IAEA TRS-457 at OAP, Thailand

Calibration Method and Absolute Measurements of Air Kerma of Diagnostic X-Ray Reference Qualities Using a Free-Air Ionisation Chamber

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