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

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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etup for the measurement of ESAK with ionization chamber (the MTS-N chips were arranged in this manner and numbered serially).

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Published

2021-04-30

How to Cite

1.
Omojola AD, Adeneye SO, Akpochafor MO, Akala IO, Agboje AA. Comparison of entrance surface air kerma measurement with MTS-N (LiF: Mg, Ti) chips with a kilovoltage X-ray source. ASEAN J Radiol [Internet]. 2021Apr.30 [cited 2021Jul.26];22(1):20-34. Available from: https://asean-journal-radiology.org/index.php/ajr/article/view/96

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