Oblique Surface Dose Calculation in High-Energy X-ray Therapy

Naomasa Narihiro, Masataka Oita, Yoshihiro Takeda

Research output: Contribution to journalArticlepeer-review


During radiation therapy, incident radiation oblique to the skin surface is high and may cause severe skin damage. Understanding the dose of radiation absorbed by the skin is important for predicting skin damage due to radiation. In this study, we used a high-energy (4 MV) X-ray system and an optically stimulated luminescence dosimeter (OSLD) that was developed for personal exposure dosimetry. We determined the dose variation and angular dependence, which are the characteristics of a small OSLD required to derive the calculation formula for the oblique surface dose. The dose variation was determined using the coefficient of variation. The maximum coefficient of variation for 66 small-field OSLDs was 1.71%. The angular dependence, obtained from the dose ratio of the dosimeter in the vertical direction, had a maximum value of 1.37. We derived a new equation in which the oblique surface dose can be calculated within the error range of −7.7-5.1%.

Original languageEnglish
Pages (from-to)415-422
Number of pages8
JournalActa medica Okayama
Issue number5
Publication statusPublished - 2020


  • angular dependence
  • high-energy X-ray therapy
  • oblique surface dose
  • optically stimulated luminescent dosimeter
  • radiotherapy

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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