Comparative Studies of Dose Measurements in Cornea and Mantle Shielding Block for High Energy Gamma Radiation (<sup>60</sup>Co) in Radiotherapy Treatment

  • M Shamsuzzaman Health Physics & Radioactive Waste Management Unit (HPRWMU) Institute of Nuclear Science and Technology (INST) Atomic Energy Research Establishment (AERE), Dhaka-1349, Bangladesh
  • MS Rahman Health Physics & Radioactive Waste Management Unit (HPRWMU), Institute of Nuclear Science and Technology (INST) Atomic Energy Research Establishment (AERE), Dhaka-1349, Bangladesh
  • Debasish Paul Health Physics & Radioactive Waste Management Unit (HPRWMU), Institute of Nuclear Science and Technology (INST) Atomic Energy Research Establishment (AERE), Dhaka-1349, Bangladesh
  • M Jahangir Alam Ahsania Mission Cancer & General Hospital Sector-10 Uttara Model Town, Dhaka-1230, Bangladesh
  • Shyamal Ranjan Chakraborty Departmnt of Physics, University of Chittagong, Chittagong-4331, Bangladesh
Keywords: Dose; Mantle block; Cornea block; Clarkson's method; Radiotherapy.

Abstract

Cornea and Mantle shielding blocks were used to evaluate the dosimetry features of blocked beam radiotherapy. These blocks were used to produce the blocked beams for 5×5 cm2 and 30×30 cm2 field sizes. Doses were measured and calculated by the Clarkson's method and compared mutually. The variations of 0.05%, 0.92% and 0.99% were observed at three dose investigation points of 5×5 cm2 field size for cornea block. For mantle block the variation between measured and calculated values were found to be 1.97%, 2.46%, 2.39%, 2.13%, 2.00% and 1.93% at six dose investigation points of 30×30 cm2 field size. In this study dose calculated by the empirical relation using correction factors CijxK and CFi were found approximately equal to the experimental value. In the cases of both cornea and mantle shielding the calculated mean value of uncertainty in dose measurement between calculated dose values of Clarkson’s method and empirical relation was found satisfactorily to be within ±5.0%, fulfilling to the International Commission on Radiation Units and Measurements (ICRU) [1].

The Chittagong Univ. J. Sci. 40(1) : 47-58, 2018

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Abstract
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Published
2018-06-28
How to Cite
Shamsuzzaman, M., Rahman, M., Paul, D., Alam, M. J., & Chakraborty, S. (2018). Comparative Studies of Dose Measurements in Cornea and Mantle Shielding Block for High Energy Gamma Radiation (<sup>60</sup&gt;Co) in Radiotherapy Treatment. The Chittagong University Journal of Science, 40(1), 47-58. https://doi.org/10.3329/cujs.v40i1.47909
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