Radiation dose rate variations in different measurement scenarios after prostate 125I brachytherapy

Takashi Hanada, Atsunori Yorozu, Riki Kikumura, Toshio Ohashi, Naoyuki Shigematsu

Research output: Contribution to journalArticlepeer-review


Purpose: This study aimed to directly compare different measurement scenarios using a supplemental radiation exposure measurement data set. Materials and methods: Two sets of measurement scenarios comparing different body postures, such as standing and chair sitting positions, and different measurement directions, such as anterior and posterior directions, were assessed for radiation dose rate variations in this study at the Tokyo Medical Center, Japan. The estimated precaution time for holding children in the spoon position while sitting was also calculated. Results: Different radiation dose rate measurement scenarios showed different variation tendencies. Radiation dose rate measurement showed higher mean values of measured radiation dose tendency in the standing position than in the sitting positions. The measurement from the anterior direction showed a slightly lower tendency than that from the posterior direction. Assuming a dose limit of 1 mSv, the precaution time calculated for children being held in the spoon position for a certain duration every day was 51.5 (range, 12.5–152.2) minutes. Conclusions: Our study presented a supplemental radiation exposure measurement data set and directly compared different measurement scenarios. Several trends in radiation exposure variations were found in the measurement scenarios at different body postures and different measurement directions. Our study data set could be a useful source of concrete information regarding radiation safety and contribute to the review and revision of public guidance in the future.

Original languageEnglish
Pages (from-to)1305-1311
Number of pages7
Issue number6
Publication statusPublished - 2021 Nov 1


  • Brachytherapy
  • Iodine-125
  • Prostate cancer
  • Radiation exposure
  • Radiation safety

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging


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