著者

竹井 泰孝 江口 佳孝 川浦 稚代 鈴木 昇一 廣瀬 悦子 広藤 喜章 本元 強 宮嵜 治

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.77, no.10, pp.1252-1254, 2021 (Released:2021-10-20)

著者

赤羽 恵一 飯本 武志 伊知地 猛 岩井 敏 大口 裕之 大野 和子 川浦 稚代 立崎 英夫 辻村 憲雄 浜田 信行 藤通 有希 堀田 豊 山崎 直 横山 須美

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.49, no.3, pp.153-156, 2014 (Released:2015-07-18)

参考文献数

14

被引用文献数

3 2

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A brief review is given of the history and methodology of external dosimetry for the lens of the eye. Under the 1989 revision to domestic radiological protection regulations, the concept on the effective dose equivalent and the dose limit to the lens of the eye (150 mSv/y) both introduced in the ICRP 1977 recommendations has changed nationwide the external monitoring methodology in non-uniform exposure situations to the trunk of a radiological worker. In such situations, which are often created by the presence of a protective apron, the worker is required to use at least two personal dosemeters, one worn on the trunk under the apron and the other, typically, at the collar over the apron. The latter dosemeter serves the dual purpose of providing the dose profile across the trunk for improved effective dose equivalent assessment and of estimating the dose to lens of the eye. The greater or appropriate value between Hp(10) and Hp(0.07), given by the dosemeter, is generally used as a surrogate of Hp(3) for recording the dose to the lens of the eye. The above-mentioned methodology was continued in the latest 2001 revision to the relevant regulations.

著者

赤羽 恵一 飯本 武志 伊知地 猛 岩井 敏 大口 裕之 大野 和子 川浦 稚代 立崎 英夫 辻村 憲雄 浜田 信行 藤通 有希 堀田 豊 山崎 直 横山 須美

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.50, no.2, pp.128-137, 2015 (Released:2016-01-09)

参考文献数

8

被引用文献数

2

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While the revised dose limit for the lens of the eye was presented by the International Commission on Radiological Protection (ICRP), the dose measurement standards for the lens of the eye have been discussed in the International Organization for Standardization (ISO). In the International Basic Safety Standards of International Atomic Energy Agency (IAEA), a new ICRP dose limit of the lens of the eye was included, and a technical document was published as a guidance on the implications of the new dose limit for the lens of the eye for occupational radiation protection. By the International Radiation Protection Association (IRPA) Task Group on Implementation of Revised Dose Limits to the Lens of the Eye, the opinions for the new ICRP dose limit for the lens of the eye are investigated for the member states. In this paper, the progress of discussion in these organizations is reported.

著者

赤羽 恵一 飯本 武志 伊知地 猛 岩井 敏 大口 裕之 大野 和子 川浦 稚代 立崎 英夫 辻村 憲雄 浜田 信行 藤通 有希 堀田 豊 山崎 直 横山 須美

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.50, no.1, pp.76-89, 2015 (Released:2015-12-18)

参考文献数

52

被引用文献数

2 4

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For many Japanese radiation workers in the medical, nuclear and other industrial fields, the equivalent dose of the lens of the eye will be sufficiently lower than the new ICRP dose limit. However, the dose of the lens of the eye for medical staff members who are engaged in interventional radiology and cardiology may exceed the new ICRP dose limit, especially when they are exposed closely to higher scatter radiation for a long time. In addition, the radiation dosimetry and radiation protection for emergency and recovery workers in the Fukushima Daiichi Nuclear Power Plant (FNPP1) are important issues. Thus gathering information related to the radiation dose and protection for Japanese radiation workers is important to a discussion regarding implementation of the new ICRP dose limit for the lens of the eye for Japanese regulations and planning radiation dose reduction measures. In this paper, recent studies and issues regarding radiation exposure and protection in the medical, nuclear and other industrial fields, as well as for emergency and recovery workers in the FNPP1 were summarized.

著者

赤羽 恵一 飯本 武志 伊知地 猛 岩井 敏 大口 裕之 大野 和子 川浦 稚代 立崎 英夫 辻村 憲雄 浜田 信行 藤通 有希 堀田 豊 山崎 直 横山 須美

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.50, no.1, pp.67-75, 2015 (Released:2015-12-18)

参考文献数

40

被引用文献数

3

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The International Commission on Radiological Protection (ICRP) and the International Commission on Radiation Units and Measurements (ICRU) have been defined operational quantities and protection quantities. Dose limits have been also recommended by the ICRP using protection quantities. These quantities and some related values for main radiation such as photons, electrons, and neutrons, are summarized in this article with some historical considerations. The ICRP indicated conversion coefficients for the lens of the eye as absorbed dose per fluence as protection quantities. Equivalent dose is not used because a protection quantity that uses radiation weighting factors is not intended to be calculated for tissue reactions. So far, the ICRP has not indicated a specific RBE value for cataract formation. Operational quantities are used for measurements. There have been three types of phantoms, namely a slab phantom, a reduced phantom, and a cylindrical phantom, but none of them has been definitely recommended for the lens of the eye by the ICRP or the ICRU. Although conversion coefficients to personal dose equivalent, Hp(3), for electrons have been recommended, no other conversion coefficients to personal dose equivalent for the lens of the eye has been indicated by the ICRP or the ICRU. However, there have been several studies described personal dose equivalent. Ambient dose equivalent, H*(3), and directional dose equivalent, H'(3,a), have been indicated in several limited conditions by the ICRP and the ICRU. These status are overviewed in this article.

著者

青山 隆彦 小山 修司 川浦 稚代 杉本 成人 藤井 啓輔 瀬口 繁信 川崎 稔生

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.47, no.4, pp.270-281, 2012 (Released:2013-12-17)

参考文献数

17

被引用文献数

1

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Data are presented on radiation doses to infant, child and adult patients undergoing head, chest and abdominal CT examinations with recent multi-detector row CT scanners (MDCT). Also presented are dose data in CT coronary angiography(CTCA) observed with Toshiba 320MDCT and Siemens 64MDCT. The doses were measured using newborn, 6-year-child and adult anthropomorphic phantoms, in which photodiode dosimeters were implanted at various tissue and organ positions. Measured doses were used to evaluate organ and effective doses. Organ doses in the scan region obtained in head CT were 20-40 mGy for infants and children, and 40-70 mGy for adults. Effective doses in head CT were 2.1-3.3 mSv for infants,and 1.0-2.0 mSv for children and adults. These doses in chest CT were 3-9 mGy and 2-6 mSv for infants, 2-12 mGy and 1-7 mSv for children, and 5-35 mGy and 7-14 mSv for adults. In abdominal CT they were 3-14 mGy and 2-10 mSv for infants, 4-18 mGy and 3-12 mSv for children, and 10-48 mGy and 9-21 mSv for adults. In CTCA radiation doses for helicalscan without using dose modulation were reduced to less than 1/6 and 1/10 by using prospectively gated axial scan of Toshiba320MDCT and “Flash Spiral” scan of Siemens 64MDCT, respectively.

著者

赤羽 恵一 飯本 武志 伊知地 猛 岩井 敏 大口 裕之 大野 和子 川浦 稚代 立崎 英夫 辻村 憲雄 浜田 信行 藤通 有希 堀田 豊 山崎 直 横山 須美

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.49, no.3, pp.145-152, 2014 (Released:2015-07-18)

参考文献数

52

被引用文献数

4 7

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In April 2011, the International Commission on Radiological Protection (ICRP) issued the statement on tissue reactions. This stimulated interest in many countries. The Expert Committee on Radiation Protection of the Lens of the Eye was established in the Japanese Health Physics Society, and in April 2013, started discussion about the international developments and recent studies related to the dosimetry of the lens of the eye. This committee now publishes the interim report consisting of parts I-VI. Of these, this Part I overviews the structure of the eye and lens, cataract types and the scientific evidence of its new dose threshold and equivalent dose limit newly recommended by the ICRP.

著者

赤羽 恵一 飯本 武志 伊知地 猛 岩井 敏 大口 裕之 大野 和子 川浦 稚代 立崎 英夫 辻村 憲雄 浜田 信行 藤通 有希 堀田 豊 山崎 直 横山 須美

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.49, no.4, pp.171-179, 2014 (Released:2015-12-18)

参考文献数

21

被引用文献数

3

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Many studies have been internationally reported as part of projects regarding the radiation exposure for the lens of the eye of medical staff members under various conditions, methods of dosimetry and development of dosimeters for the lens of the eye. Recently conducted studies include the Retrospective Evaluation of Lens Injuries and Dose (RELID) of the International Atomic Energy Agency, Occupational Cataracts and Lens Opacities in interventional Cardiology (O’CLOC) study in France, Optimization of Radiation Protection of Medical Staff (ORAMED) project in European countries, and a 20-year prospective cohort study among US radiologic technologists. Given the newly implemented dose limit for the lens of the eye by the International Commission on Radiological Protection (ICRP), we summarized these studies as the necessary information for reconsideration of the Japanese dose limit for the lens of the eye. In addition, this article also covers the exposures for the lens of the eye of clean-up workers in the Chernobyl accident as shown in ICRP Publication 118 and the results of a hearing survey with specialists of the Academy of Medical Science of Ukraine.

著者

川浦 稚代 青山 隆彦 小山 修司

出版者

公益社団法人 日本アイソトープ協会

雑誌

RADIOISOTOPES (ISSN:00338303)

巻号頁・発行日

vol.54, no.3, pp.55-66, 2005-03-15 (Released:2011-03-01)

参考文献数

17

被引用文献数

3 3

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蛍光ガラス線量計とフォトダイオード線量計を設置した人体ファントム線量計測システムを用いて, 頭部一般撮影検査及び頭部X線CT検査における患者の臓器及び実効線量評価を行った。5種類の頭部一般撮影検査における脳線量は, 0.46~1.08mGyであった。水晶体線量は, 水晶体に直接X線が当たるような頭部正面 (AP) 及びタウン撮影法において最も高かった。また, 頭部一般撮影検査における実効線量は, 0.03~0.06mSvであった。一方, 頭部X線CT検査 (ルーチン検査) における実効線量は, 1.7mSvであり, 頭部正面 (AP) 検査よりも50倍以上高いことがわかった。急性脳梗塞の診断に用いられるPerfusion検査においては, 最大皮膚線量が712.0mGyとなった。しかしながら, その値は, ICRP Publ.59で提唱されている一時脱毛のしきい値3Gyよりも低かった。また, 頭部X線CT検査における水晶体線量 (ルーチン検査: 55.0mGy, Perfusion検査: 39.6mGy) は, ICRP Publ.60で提唱されている検知可能な水晶体白濁のしきい値0.5~2.0Gyよりも低い値を示した。

著者

今井 國治 藤井 啓輔 池田 充 川浦 稚代 川浦 稚代 藤井 啓輔

出版者

名古屋大学

雑誌

基盤研究(C)

巻号頁・発行日

2014-04-01

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本申請研究の主たる目的は、CT検査時における被ばく線量(重要臓器線量)を測定した上で、申請者がCT画像上で発現に成功させた確率共鳴現象を利用して、病変検出能の向上を図ると共に、CT検査時の被ばく線量軽減を行うことである。特に今回は脳梗塞部の検出(脳溝の狭小化や早期虚血性病変)に主眼を置き、どのような条件の時に効果的に確率共鳴が発現するかを検討し、最終的に臨床への応用を目指す。確率共鳴はノイズ強度が10HUの時に最も効率よく発現し、コントラスト分解能も鮮鋭度も大きく改善した。また、この改善効果はノイズの種類に依存し、高周波を多く含むノイズを付加した際に、その効果が大きくなることを定量的に示した。