Building a Graphite Calorimetry System for the Dosimetry of Therapeutic X-ray Beams

Kim, In Jung; Kim, Byoung Chul; Kim, Joong Hyun; Chung, Jin Wan; Kim, Hyun Moon; Yi, Chul-Young

doi:10.1016/j.net.2017.01.015

Cited by 13 publications

(5 citation statements)

References 7 publications

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“…The primary standard of absorbed dose to water at linear accelerator (LINAC) high-energy X-ray beams at the KRISS is the KRISS graphite calorimeter (C1505-4). This calorimeter was constructed in 2015 [4] with a small graphite core (16 mm diameter, 3 mm thickness) and two layers of thermal jackets to isolate the core from environmental temperature changes. The core has three thermistors to sense the core's temperature and another thermistor for electrical heating to the core.…”

Section: Kriss Primary Standard Absorbed Dose To Watermentioning

confidence: 99%

“…2019-6 "Technical standards for radiation safety management in the medical field, " a medical institution shall establish the documented dosimetry quality management procedures to confirm that the dose delivery to the patient shall be maintained as prescribed and perform the quality management process accordingly. The quality management components Progress in Medical Physics 33 (4) one-to-one comparison run by the KRISS is denoted as the "measurement audit" (MA). The MA is different from the ordinary PT in that the reference value directly traceable to the primary standard is presented to the MA, whereas the "assigned value" replaces the reference value in the PT.…”

Section: Introductionmentioning

confidence: 99%

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Proficiency Test for the Dosimetry Audit Service Provider

Kim

Park

et al. 2022

Progress in Medical Physics

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The proficiency test was conducted to assess the performance of the dosimetry audit service provider in the readout practice of the dose delivered to patients in medical institutions.Methods: A certain amount of the absorbed dose to water for the high-energy X-ray from the medical linear accelerator (LINAC) installed in the Korea Research Institute of Standards and Science (KRISS) was delivered to the postal dose audit package given by the dosimetry audit service provider, in which the radio-photoluminescence (RPL) glass dosimeters were mounted. The dosimetry audit service provider read the RPL glass dosimeters and sent the readout dose value with its uncertainty to KRISS. The performance of the dosimetry audit service provider was evaluated based on the E n number given in ISO/IEC 17043:2010. Results:The evaluated E n number was −0.954. Based on the ISO/IEC 17043, the performance of the dosimetry service provider is "satisfactory."Conclusions: As part of the conformity assessment, the KRISS performed the proficiency test over the postal dose audit practice run by the dosimetry audit service provider. The proficiency test is in line with confirming the traceability of the medical institutions to the primary standard of absorbed dose to the water of the KRISS and ensuring the confidence of the dosimetry audit service provider.

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Section: Kriss Primary Standard Absorbed Dose To Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proficiency Test for the Dosimetry Audit Service Provider

Kim

Park

et al. 2022

Progress in Medical Physics

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“…where C eff is the effective heat capacity (J K −1 ) of the core (McEwen and Dusautoy 2009, Kim et al 2017, Renaud et al 2018, T core is the temperature (K) of the core, P irr is the rate of radiation energy imparted (J s −1 ) to the core, P heater is the rate of electrical heat dissipation (J s −1 ) of the core heater, P s.h. is the rate of electrical heat dissipation (J s −1 ) of the sensor thermistors of the core (i.e.…”

Section: Model Equationmentioning

confidence: 99%

“…The output of the LINAC x-ray beams was monitored with a set of external beam monitoring chambers. Two thimble-type ion chambers (Exradin A2, Standard Imaging) were placed just after the multi-leaf collimators at 660 mm from the target being separated by 125 mm along the cross-line direction (Kim et al 2017). The LINAC output was monitored by the external monitor chambers and the deviation was around 0.15% (min to max).…”

Section: Irradiationmentioning

confidence: 99%

“…In figure 3, t o,labview was January 1, 1904, since this is the year zero of the LabVIEW time stamp (Bitter et al 2006). V 0 core was experimentally determined in a separate study (Kim et al 2017) in order to make the temperature rise under the electrical calibration heating could be approximately the same as during irradiation. The ∆V Q−adia jacket value was not critical since G jacket was set so large at 100 000.…”

Section: Corementioning

confidence: 99%

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Operating a graphite calorimeter in quasi-isothermal mode under high-energy x-ray beams

Kim

Kim²,

Park³

et al. 2020

Phys. Med. Biol.

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In this study, we developed a semi-active method to run a graphite calorimeter in the quasi-isothermal mode under high-energy x-ray beams. The rate of energy imparted by the beam during irradiation was compensated mainly by removing the electrical heating power based on the pre-calculation and in part by an active automated algorithm, as well, while the temperature of the calorimeter core was kept constant. Irradiations were performed under the linear electron accelerator x-ray beams at 6, 8, 10, 15, and 18 MV. A simple model was applied to analyze the results. The energy imparted to the core was determined with an uncertainty level of 0.2%–0.3%, and the results were reaffirmed by comparing it with that obtained by the quasi-adiabatic mode. The normalized root-mean-square deviation to the mean from the quasi-adiabatic mode was 0.11%, and the associated uncertainty was 0.16% taking into account the correlation of the uncertainty components. This level of agreement showed that the present method is practical for the high-energy x-ray dosimetry.

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Changes of KRISS primary standards by implementing ICRU 90 recommendation

Kim

et al. 2021

J. Korean Phys. Soc.

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Building a Graphite Calorimetry System for the Dosimetry of Therapeutic X-ray Beams

Cited by 13 publications

References 7 publications

Proficiency Test for the Dosimetry Audit Service Provider

Proficiency Test for the Dosimetry Audit Service Provider

Operating a graphite calorimeter in quasi-isothermal mode under high-energy x-ray beams

Changes of KRISS primary standards by implementing ICRU 90 recommendation

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