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http://dx.doi.org/10.7742/jksr.2022.16.1.61

Derivation of Photon Energy Fluence and Mass Energy Absorption Coefficient for 1 Gy Absorbed Dose of Water in Brachytherapy using Ir192 Source  

Kim, Jong-Eon (Department of Radiological Science, Kaya University)
Ahn, Il-Hoon (Department of Gem Design Engineering, Kaya University Graduate School)
Publication Information
Journal of the Korean Society of Radiology / v.16, no.1, 2022 , pp. 61-66 More about this Journal
Abstract
The purpose of this study is to derive photon energy fluence and mass energy absorption coefficient for 1 Gy of absorbed dose of water in brachytherapy using an Ir192 source. From the radiotherapy physics written by Khan, the half-value of lead for the gamma ray beam of the Ir192 source was obtained. The linear attenuation coefficient and the mass attenuation coefficient were calculated from the obtained half-value layer of lead. By matching the calculated lead mass attenuation coefficient with the NIST mass attenuation coefficient data, the photon energy of the matching mass attenuation coefficient was determined as the effective energy. By matching the determined effective energy with the photon energy of the NIST data on the mass energy absorption coefficient of water, the mass energy absorption coefficient of water was obtained as 0.03273 cm2/g(32.73 cm2/kg). The photon energy fluence was calculated as 0.03055 J/cm2 by dividing the obtained mass energy absorption coefficient (32.73 cm2/kg) by the absorbed dose of water 1 Gy.
Keywords
Effective energy; Mass attenuation coefficient; Mass energy absorption coefficient; Absorbed dose;
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Times Cited By KSCI : 2  (Citation Analysis)
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1 F. M. KHAN, The Physics of Radiation Therapy, 3rd Ed., Wolters Wluwer Co., New York, pp. 59~377, 2003.
2 S. C. Chen, W. L. Jong, A. Z. Harun, "Evaluation of X-ray Beam Quality Based on Measurements and Estimations Using SpekCalc and Ipem 78 models", Malaysian Journal of Medical Sciences, Vol. 19, No. 3, pp. 22-28, 2012.
3 A. Akkas, "Determination of the Tenth and Half Value Layer Thickness of Concretes with Different Densities", Acta Physica Polonica A, Vol. 129, No. 4, pp. 770-772, 2016. http://dx.doi.org/10.12693/APhysPolA.129.770   DOI
4 International Standard ISO 4037-1, X and gamma reference radiation for calibrating dosimetersand doserate meters and for determining their response as a function for photon energy-Part 1: Radiation characteristics and production methods, 1st Ed., ISO, pp. 1-4, 1996.
5 J. E. Kim, "Determination of Effective Energy of CT X-ray Beams", Journal of the Korean Society of Radiology, Vol. 13, No. 4, pp. 517-522, 2019. http://dx.doi.org/10.7742/jksr.2019.13.4.517   DOI
6 M. R. Millner, W. H. Payne, R. G. Waggener, W. D. McDavid, M. J. Dennis, V. J. Sank, "Determination of Effective Energies in CT Calibration", Medical Physics, Vol. 5, No. 6, pp. 543-545, 1978. https://doi.org/10.1118/1.594488   DOI
7 J. Burger, "Radioactive sources in brachytherapy", Radiology and Oncology, Vol. 37, No. 2, pp. 127-131, 2003.
8 National Institute of Standards and Technology, "NIST Measurement Services: Calibration of X-ray and Gamma-ray Measuring Instruments", NIST Special Publication 250-58, pp. 1-96, 2001.
9 J. E. Kim, "Quality Assurance on Dose Distribution of Ir-192 Line Source", Journal of Radiological Science and Technology, Vol. 30, No. 1, pp. 33-38, 2007.
10 C. M. Ma. Chair, C. W. Coffey, L. A. DeWerd, C. Liu, R. Nath, S. M. Seltzer, J. P. Seuntjens, "AAPM protocol for 40-300 kV x-ray beam dosimetry in radiotherapy and radiobiology", Medical Physics, Vol. 28, No. 6, pp. 869-875, 2001. https://doi.org/10.1118/1.1374247   DOI
11 J. E. Kim, S. h. Lee, "Determination of the Effective Energy of an X-ray Beam Uusing Optically Stimulated Luminescent nanoDot Dosimeters", Journal of Korean Society of Radiology, Vol. 9, No. 6, pp. 375-379, 2015. http://dx.doi.org/10.7742/jksr.2015.9.6.375   DOI
12 J. H. Hubbell, "Photon mass attenuation and energy absorption coefficients from 1 keV to 20 MeV", The International Journal of Applied Radiation and Isotopes, Vol. 33, No. 11, pp. 1269-1290, 1982. https://doi.org/10.1016/0020-708X(82)90248-4   DOI
13 https://physics.nist.gov/PhysRefData/XrayMassCoef/ComTab/water.html
14 https://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z82.html