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Zhao R, Wu J, Wen Y, Lv Y, Guo B, Liao Z. CALIBRATION METHOD AND ABSOLUTE MEASUREMENTS OF AIR KERMA OF DIAGNOSTIC X-RAY REFERENCE QUALITIES USING A FREE-AIR IONISATION CHAMBER. RADIATION PROTECTION DOSIMETRY 2021; 197:28-35. [PMID: 34718819 DOI: 10.1093/rpd/ncab161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 09/26/2021] [Accepted: 10/10/2021] [Indexed: 06/13/2023]
Abstract
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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Affiliation(s)
- Rui Zhao
- Division of Ionizing Radiation Metrology, National Institute of Metrology, No. 18, Bei San Huan Dong Lu, Chaoyang Dist., Beijing 100029, China
| | - Jinjie Wu
- Division of Ionizing Radiation Metrology, National Institute of Metrology, No. 18, Bei San Huan Dong Lu, Chaoyang Dist., Beijing 100029, China
| | - Yuqin Wen
- Division of Ionizing Radiation Metrology, National Institute of Metrology, No. 18, Bei San Huan Dong Lu, Chaoyang Dist., Beijing 100029, China
| | - Yazhu Lv
- Division of Ionizing Radiation Metrology, National Institute of Metrology, No. 18, Bei San Huan Dong Lu, Chaoyang Dist., Beijing 100029, China
| | - Bin Guo
- Division of Ionizing Radiation Metrology, National Institute of Metrology, No. 18, Bei San Huan Dong Lu, Chaoyang Dist., Beijing 100029, China
| | - Zhenyu Liao
- Division of Ionizing Radiation Metrology, National Institute of Metrology, No. 18, Bei San Huan Dong Lu, Chaoyang Dist., Beijing 100029, China
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