A PRELIMINARY STUDY OF RADIATION QUALITY CORRECTION FACTOR (KQ) DETERMINATION FOR WELL-TYPE IONIZATION CHAMBER

Authors

  • Assef Firnando F Center for Safety Technology and Radiation Metrology (PTKMR) BATAN, Jakarta, Indonesia
  • Okky Agassy Firmansyah Center for Safety Technology and Radiation Metrology (PTKMR) BATAN, Jakarta, Indonesia
  • Cahya Wulandari General Hospital Dr. H. Abdul Moeloek, Lampung, Indonesia
  • R. Pramuji Ramadhani S General Hospital Dr. H. Abdul Moeloek, Lampung, Indonesia

DOI:

https://doi.org/10.21009/SPEKTRA.052.05

Keywords:

brachytherapy, radiation quality correction factor, kQ, ionization chamber, traceability, well-type

Abstract

This paper deals with the determination of the radiation quality correction factor (kQ) well-type ionization chamber for the measurement of Co-60 brachytherapy. The measurement of the brachytherapy source has been done in the hospital brachytherapy facilities. The measurement of air Kerma has been done using three different ionization chambers 0.6 cm3, 30 cm3, 80 cm3, which have calibration factor traceability for Co-60 and one well-type ionization chamber which calibrated for Ir-192. The determination of the radiation quality correction factor (kQ) was determined based on the results of the air Kerma ratio between measurements using ionization chambers, which have traceability to Co-60 and Ir-192 sources. The results of the measurement of the reference air Kerma rate (RAKR) obtained from the three chambers were 21.36, 19.87, 19.34 mGy.m2.h-1, while the results of measurements with ionization chambers get a value of 19.01 mGy.m2.h-1. The kQCal results from 0.6 cm3 ionization chamber get a value of 1.07. The kQCal value was compared with the value of Andreas Schuller’s et al. kQreff of 1.05 and get a deviation of 2.2%. Implementation of the booth kQ value on the results of the RAKR from the HDR1000Plus well-type ionization chamber in the measurement of brachytherapy in two different facilities gets a maximal deviation 1.7% with dose value from Treatment Planning System (TPS). The deviation was in the acceptable range of ±5%. Based on this, the use of radiation quality correction factor (kQ) value can be implemented as one method if it does not have the traceability factor calibration of the Co-60 brachytherapy source.

References

[1] N. Suntharalingam, E. Podgorsak and H. Tölli, “Brachytherapy: Physical and Clinical Aspects,” Radiation Oncology Physics: A Handbook for Teachers and Students., N, Sunthar., Austria: International Atomic Energy Agency, 2005.
[2] G. Kemİkler, “History of Brachytherapy,” Turkish J. Oncol., 2019, vol. 34.
[3] S. Strohmaier and G. Zwierzchowski, “Comparison of Co-60 and Ir-192 sources in HDR brachytherapy,” J. Contemp. Brachytherapy, 2011, vol. 3.
[4] A. L. Palmer, M. Bidmead and A. Nisbet, “A survey of quality control practices for high dose rate (HDR) and pulsed dose rate (PDR) brachytherapy in the United Kingdom,” J. Contemp. Brachytherapy, 2012, vol. 4.
[5] K. P. Adhikari et al., “Acceptance Testing, Commissioning and Quality Assurance for a Nucletron 192Ir Hdr Brachytherapy Afterloader At Nams, Bir Hospital,” Sci. World, 2015, vol. 12.
[6] B. Nagappan et al., “Brachytherapy source calibration, reviews, and consistency of 192 Ir high ‑ dose rate afterloading sources supplied over the period of 10 years : A retrospective analysis,” Radiat. Prot. Environ., 2016, vol. 38.
[7] C. Austerlitz et al., “Consistency of vendor-specified activity values for 192Ir brachytherapy sources,” Med. Dosim., 2012, vol. 37.
[8] International Atomic Energy Agency, “IAEA-TECDOC-1274: Calibration of photon and beta ray sources used in brachytherapy,” 2002.
[9] S. Bondel and M. Ravikumar, “Determination of contributions of scatter and distance error to the source strength of 192 Ir HDR brachytherapy source,” Polish J. Med. Phys. Eng., 2016, vol. 22.
[10] S. Bondel, M. Ravikumar and S. S. Supe, “Calibration of 192 Ir high dose rate brachytherapy source using different calibration procedures,” Reports Pract. Oncol. Radiother., 2014, vol. 19.
[11] S. Vandana and S. D. Sharma, “Long term response stability of a well-type ionization chamber used in calibration of high dose rate brachytherapy sources,” J. Med. Phys., 2010, vol. 35.
[12] H. A. Azhari et al., “Dosimetric verification of source strength for HDR afterloading units with Ir-192 and Co-60 photon sources : Comparison of three different international protocols,” J. Med. Phys., 2012, vol. 37.
[13] W. Chu et al., “Reference air kerma rate calibration system for high dose rate Ir-192 brachytherapy sources in Taiwan,” Radiat. Phys. Chem., 2017, vol. 140.
[14] T. Sander, “Air kerma and absorbed dose standards for reference dosimetry in brachytherapy,” Br. Inst. Radiol., 2014. vol. 87.
[15] A. Schüller et al., “A radiation quality correction factor kQ for well-type ionization chambers for the measurement of the reference air kerma rate of 60Co HDR brachytherapy sources A radiation quality correction factor kQ for well-type ionization chambers for the measurement,” 2015.
[16] D. R. Shipley, T. Sander and R. F. Nutbrown, “Source geometry factors for HDR 192 Ir brachytherapy secondary standard well-type ionization chamber calibrations,” Phys. Med. Biol., 2015, vol. 60.
[17] M. Taghi et al., “Air kerma strength characterization of a GZP6 Cobalt-60 brachytherapy source,” Reports Pract. Oncol. Radiother., 2010, vol. 15.
[18] S. Bondel and M. Ravikumar, “Determination of contributions of scatter and distance error to the source strength of 192 Ir HDR brachytherapy source,” J. Med. Phys. Eng., 2016, vol. 22.
[19] S. Saminathan, H. F. Godson and R. Manickam, “Dosimetric evaluation of newly developed well-type ionization chamber for use in the calibration of brachytherapy sources,” J. Med. Phys., 2017, vol. 41.
[20] L. C. S. Ho and T. L. H. Ding, “Ir-192 Calibration in Air with Farmer Chamber for HDR Brachytherapy,” J. Med. Biol. Eng., 2016, vol. 36.
[21] S. J. Goetsch et al., “Calibration of Ir 192 highdoserate afterloading systems,” Med. Phys., 1990, vol. 18.
[22] L. Chang et al., “Room Scatter Factor Modelling and Measurement Error Analysis of Ir-192 HDR Calibration By a Farmer Chamber,” Physics in Medicine & Biology, 2007, vol. 52.

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Published

2020-08-31

How to Cite

Firnando F, A., Firmansyah, O. A., Wulandari, C., & Ramadhani S, R. P. (2020). A PRELIMINARY STUDY OF RADIATION QUALITY CORRECTION FACTOR (KQ) DETERMINATION FOR WELL-TYPE IONIZATION CHAMBER. Spektra: Jurnal Fisika Dan Aplikasinya, 5(2), 129–140. https://doi.org/10.21009/SPEKTRA.052.05