Radiological Physics and Technology

, Volume 12, Issue 4, pp 401–408 | Cite as

Angular dependence of shielding effect of radiation protective eyewear for radiation protection of crystalline lens

  • Yuma Hirata
  • Toshioh FujibuchiEmail author
  • Katsuya Fujita
  • Takayuki Igarashi
  • Eiji Nishimaru
  • Shogo Horita
  • Reiko Sakurai
  • Koji Ono


Radiation protective (RP) eyewear effectively protects crystalline lenses from radiation exposure. A drawback of RP eyewear is the angular dependence of the shielding effect, which results from the design of the eyewear. In this study, 21 models of RP eyewear with different designs and lead equivalences were assessed. Each piece of RP eyewear was hung on a Styrofoam phantom that imitated the head, and a 0.125-cc ionization chamber dosimeter was placed at the position of the crystalline lens. The differences in angular dependence of the shielding effect were evaluated by changing the irradiation angle, and parameters that improved the angular dependence of the shielding effect—sufficient lead equivalence, large coverage design, and minimum gap between the crystalline lens and the RP eyewear—were identified. Thus, the findings highlight the importance of selecting RP eyewear according to the angular distribution and the nature of radiation exposure in the workplace for radiation workers.


Angular dependence Crystalline lens Interventional radiology Radiation protective eyewear Shielding rate 



This research was supported by an NSR Grant for Radiation Safety Regulation Research Strategic Promotion 2017, Japan.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies performed with human or animal participants.


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Copyright information

© Japanese Society of Radiological Technology and Japan Society of Medical Physics 2019

Authors and Affiliations

  1. 1.Department of Health Sciences, Graduate School of Medical ScienceKyushu UniversityFukuoka CityJapan
  2. 2.Department of Health Sciences, Faculty of Medical SciencesKyushu UniversityFukuokaJapan
  3. 3.Department of RadiologyNational Hospital Organization Kanagawa HospitalKanagawaJapan
  4. 4.Department of Radiological TechnologyInternational University of Health and Welfare Narita HospitalChibaJapan
  5. 5.Department of Diagnostic RadiologyHiroshima UniversityHiroshimaJapan
  6. 6.Faculty of NursingTokyo Healthcare UniversityTokyoJapan

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