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Absorbed dose to water standard of high-energy x-rays at the KRISS

  • Original Paper - Cross-Disciplinary Physics and Related Areas of Science and Technology
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Abstract

The Korea Research Institute of Standards and Science (KRISS) established the standard of absorbed dose to water of high-energy x-rays based on the graphite calorimetry. Some of the ionization chambers were directly calibrated under high-energy x-rays. Uncertainty of the chamber calibration was 0.43% (k = 1). kQ,Q0, the beam quality correction factor, of the chambers were determined for the chamber models of the NE2571 and PTW30013, too. Determined kQ,Q0 showed good agreement with the literal data within the stated uncertainty. International equivalence of this KRISS standard was also confirmed, in separate studies, by participating in international comparison studies with the National Metrology Institute of Japan and also with the Bureau international des poids et mesures (BIPM.RI(I)-K6). Now, the KRISS is providing a direct calibration service for user’s ionization chambers under high-energy x-rays. This service could contribute improving the quality assurance of x-ray therapy at hospitals by reducing the uncertainty of dose measurement.

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Acknowledgements

This work was supported by the Korea Research Institute of Standards and Science, Rep. of Korea under the project ‘Development of measurement standards for ionizing radiation’ with the grant number 19011053.

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  1. Korea Research Institute of Standards and Science, Daejeon, 34113, Korea

    In Jung Kim, Yun Ho Kim & Chul-Young Yi

  2. University of Science and Technology, Daejeon, 34113, Korea

    In Jung Kim

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Kim, I.J., Kim, Y.H. & Yi, CY. Absorbed dose to water standard of high-energy x-rays at the KRISS. J. Korean Phys. Soc. 81, 1004–1012 (2022). https://doi.org/10.1007/s40042-022-00619-3

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