Japanese
Title核医学検査における患者からの検者の被ばく線量
Subtitle原著
Authors柏倉健一*, 金谷信一*, 柏倉明美*, 小林秀樹*, 牧正子*, 日下部きよ子*
Authors(kana)
Organization*東京女子医科大学放射線科
Journal核医学
Volume33
Number5
Page477-483
Year/Month1996/5
Article原著
Publisher日本核医学会
Abstract「要旨」放射性医薬品を投与された患者から核医学検査中に検者がどの程度被ばくするかを評価するため, 5種類の代表的な検査における平均被ばく線量を高感度半導体ポケット線量計を用いて測定した. また, 放射性医薬品投与5分後と検査直前における空間線量率(患者体表から5, 50, 100cm)を電離箱サーベイメータを用いて測定した. さらに, 患者周囲における空間線量率分布の測定を行った. この結果, 検査中に患者から受ける被ばく線量は1検査あたり0.3〜1.6μSvと比較的小さく問題は少ないと考えられた. だたし, 不必要な被ばくは避けるべきであり, この意味で空間線量率と空間線量率分布は検者の被ばく低減のための基礎資料として有用と考える. また, 半導体ポケット線量計を個人モニタリングに使用することで被ばく線量を大きく低減できる可能性が示唆された.
Practice臨床医学：一般
KeywordsRadiation exposure, Radioactive patient, Nuclear medicine study.
English
TitleExposure to the Technologists from Radioactive Patients during Nuclear Medicine Studies
SubtitleOriginal article
AuthorsKenichi KASHIKURA, Shinichi KANAYA, Akemi KASHIKURA, Hideki KOBAYASHI, Masako MAKI, Kiyoko KUSAKABE
Authors(kana)
OrganizationDepartment of Radiology, Tokyo Women's Medical College
JournalThe Japanese Journal of nuclear medicine
Volume33
Number5
Page477-483
Year/Month1996/5
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary]In order to evaluate the exposure to the nuclear medicine technologists from patients who had been administrated with radiopharmaceuticals, we measured the exposure in 5 common diagnostic procedures(bone, lung, tumor scan, and brain, myocardial SPECT, n=8 to 52)using a silicon semiconductor pocket dosimeter. We also measured the spatial dose rates at 5 cm, 50 cm, and 100 cm from skin surface of the patients(n=10 to 21) using an ionization chamber, both 5 min after injection and right before the studies with the same procedures above. We further measured the spatial dose rate distributions around the patients in the 4 procedures(bone, renal, blood pool scan, and brain SPECT, n=2 to 3). In results, the exposure to the technologists in each procedure was small(0.5, 0.5, 0.7, 1.6, and 0.3μSv in each bone, lung, tumor scan, and brain, myocardial SPECT, respectively), compared with the dose limits of the medical workers. However, the dose-response relationships in cancer and hereditary effects, referred to as the stochastic effects, have been assumed linear and no threshold models ; therefore, the exposure should be minimized. For this purpose, the measurements of spatial dose rates and spatial dose rate distributions were thought to be useful. The differences of these results among procedures were caused by the differences of dose distributions and physical and biological half lives of the radiopharmaceuticals. The results of the measurements in 7 consecutive weeks suggested that the direct measurement of the exposure using a high sensitive digital pocket dosimeter might result a reduced exposure to the technologists.
PracticeClinical medicine
KeywordsRadiation exposure, Radioactive patient, Nuclear medicine study.

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