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7 results on '"Nabatame, Kuniaki"'

3. The Japan Health Physics Society Guideline on Dose Monitoring for the Lens of the Eye

Author

Yokoyama, Sumi, Tsujimura, Norio, Hashimoto, Makoto, Yoshitomi, Hiroshi, Kato, Masahiro, Kurosawa, Tadahiro, Hideo, Tatsuzaki, Sekiguchi, Hiroshi, Koguchi, Yasuhiro, Ono, Koji, Akiyoshi, Masahumi, Kunugita, Naoki, Natsuhori, Masahiro, Natsume, Yoshinori, Nabatame, Kuniaki, Kawashima, Tsunenori, Takagi, Shunji, Ohno, Kazuko, and Iwai, Satoshi

Abstract

Background In Japan, new regulations that revise the dose limit for the lens of the eye (hereafter the lens), operational quantities, and measurement positions for the lens dose were enforced in April 2021. Based on the international safety standards, national guidelines, the results of the Radiation Safety Research Promotion Fund of the Nuclear Regulation Authority, and other studies, the Working Group of Radiation Protection Standardization Committee, the Japan Health Physics Society (JHPS) developed a guideline for radiation dose monitoring for the lens. Materials and Methods The Working Group of the JHPS discussed the criteria of non-uniform exposure and the management criteria set not to exceed the dose limit for the lens. Results and Discussion In July 2020, the JHPS guideline was published. The guideline consists of three parts: main text, explanations, and 26 examples. In the questions, the corresponding answers were prepared, and specific examples were provided to enable similar cases to be addressed. Conclusion With the development of the guideline on radiation dose monitoring of the lens, radiation managers and workers will be able to smoothly comply with revised regulations and optimize radiation protection. Keywords: New Dose Limit to the Lens of the Eye, Monitoring Guideline, Operational Quantities, Management Criteria, Non-uniform Exposure, Japan Health Physics Society

Published
2022

4. Current situations and discussions in Japan in relation to the new occupational equivalent dose limit for the lens of the eye

Author

Yokoyama, Sumi, primary, Hamada, Nobuyuki, additional, Hayashida, Toshiyuki, additional, Tsujimura, Norio, additional, Tatsuzaki, Hideo, additional, Kurosawa, Tadahiro, additional, Nabatame, Kuniaki, additional, Ohguchi, Hiroyuki, additional, Ohno, Kazuko, additional, Yamauchi-Kawaura, Chiyo, additional, Iimoto, Takeshi, additional, Ichiji, Takeshi, additional, Hotta, Yutaka, additional, Iwai, Satoshi, additional, and Akahane, Keiichi, additional

Published
2017
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7. Estimation of organ doses and effective doses in image-guided respiration-gated radiotherapy.

Author

Nakao M, Obara S, Nabatame K, Akahane K, Sanada S, and Shirai T

Subjects
Adult, Anthropometry, Calibration, Female, Fluoroscopy methods, Humans, Male, Phantoms, Imaging, Photons, Radiation Dosage, Radiometry, Reference Values, Respiration, Skin radiation effects, X-Rays, Radiotherapy methods, Radiotherapy, Image-Guided methods
Abstract

Dose conformity in thoracic and abdominal ion-beam radiotherapy is degraded by respiratory motion. To improve conformity, an image-guided respiration-gated system can be used in the treatment room. The purpose of this study was to estimate the organ doses and effective doses to patients from an image-guided respiration-gated system. Glass dosemeters were inserted into an adult anthropomorphic phantom and were attached to the surface on the phantom. The phantom was placed on the treatment couch, and the imaging dose from fluoroscopy was evaluated. In addition to the organ doses, the effective doses were also estimated according to the ICRP Publication 103. The irradiation time is over 3-5 min per beam angle. When image acquisition conditions were assumed for thoracic treatment, the effective doses and maximal skin doses were 0.48-0.79 mSv and 5.9-9.9 mGy, respectively. The estimated doses can be the base data for considering radiological protection in the radiotherapy., (© The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.)

Published
2016
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