Comparison of entrance surface air kerma measurement with MTS-N (LiF: Mg, Ti) chips with a kilovoltage X-ray source

Akintayo Daniel Omojola; Samuel Olaolu Adeneye; Michael Onoriode Akpochafor; Isiaka Olusola  Akala; Azuka Anthonio  Agboje

doi:10.46475/aseanjr.v22i1.96

Authors

Akintayo Daniel Omojola, M.Sc. Department of Radiology, Medical Physics Unit, Federal Medical Centre Asaba, Delta State, Nigeria
Samuel Olaolu Adeneye, Ph.D. Department of Radiation Biology, Radiotherapy and Radiodiagnosis, College of Medicine, University of Lagos, Lagos, Nigeria
Michael Onoriode Akpochafor, Ph.D. Department of Radiation Biology, Radiotherapy and Radiodiagnosis, College of Medicine, University of Lagos, Lagos, Nigeria
Isiaka Olusola Akala, M.Sc. Department of Radiology, Lagos University Teaching Hospital, Ikeja, Lagos, Lagos State , Nigeria
Azuka Anthonio Agboje, M.Sc. Department of Radiology, Medical Physics Unit, Federal Medical Centre Asaba, Delta State, Nigeria

DOI:

https://doi.org/10.46475/aseanjr.v22i1.96

Keywords:

Entrance surface air kerma, Backscatter Radiation, Accuracy, Ionization Chamber, Detector, MTS-N Chips

Abstract

Objective: Radiation detectors are key components that ensure the accuracy and performances of dosimetry equipment. The study is aimed to compare the mean entrance surface air kerma (ESAK) between a DCT-10mm ionization chamber (IC) and MTS-N (LiF: Mg, Ti) chips when both detectors are exposed to ≤ 5mGy with a 10 by 10 field size, with an X-ray source and to determine the accuracy of the Thermoluminescent (TL) chips. Also, the dose will be compared to similar studies.

Materials and Methods: A functional, Digital Radiography (DR) X-ray System was used. A DCT-10mm ionization chamber (IC) and an XR Multidetector was positioned at a Source to Image Distance (SID) of 100cm on polystyrene, about 20cm thick. An X-ray spectrum generated at a Practical Peak Voltage (PPV) of 60-107kV with Half Value Layer (HVL) of 2.4-4.3mmAl and filtration > 3mmAl was used. The same setup was used for the MTS-N chips.

Results: The mean doses for 1-5 mGy with the MTS-N chips were 1.07±0.07, 1.60±0.13, 2.23±0.11, 2.58±0.07 and 3.45±0.10 mGy respectively, with accuracies of 7, 20, 26, 36 and 31%. Dose accuracy at 1and 2mGy was within 25% respectively. Dose accuracies at 3, 4 and 5mGy was within >25%. The correction factor for 1-5mGy was 0.94, 1.25, 1.35, 1.55 and 1.45 respectively.

Conclusion: Validation of the MTS-N chips with the reference ionization chamber to this study was within 36%. The Radiation and Nuclear Safety Authority (STUK) recommends that ESAK be within 25% for entrance surface dose. ESAK accuracy mostly increased with dose as observed in this study.

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Author Biographies

Michael Onoriode Akpochafor, Ph.D., Department of Radiation Biology, Radiotherapy and Radiodiagnosis, College of Medicine, University of Lagos, Lagos, Nigeria

Senior Lecturer

Isiaka Olusola Akala, M.Sc. , Department of Radiology, Lagos University Teaching Hospital, Ikeja, Lagos, Lagos State , Nigeria

Radiology/Medical Physicist

Azuka Anthonio Agboje, M.Sc. , Department of Radiology, Medical Physics Unit, Federal Medical Centre Asaba, Delta State, Nigeria

Radiology/ Medical imaging

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