title: An accidental exposure by a medical linear accelerator under construction.
abstract: A radiation accident occurred at a medical linear accelerator facility under construction in Japan. The radiation source was a 3- and 6-MV potential drop accelerator designed to produce X-rays for radiation therapy. This accelerator was also capable of producing a 5 to14-MV swept electron beam. During setting up, an operator turned on the accelerator to test the beam not knowing that a man was working on the ceiling above the accelerator. Thus, an X-ray beam was emitted against the ceiling and the man was exposed to 10-MV of X-ray irradiation. However, no obvious physical symptoms were noted. Dose estimation was made from reconstruction of the accident and clinical examinations including chromosome analysis. Mean dose of the whole body ranged from 70 to 180 mSv. Estimated dose from his right foot to hand was between180 to 900 mSv.
authors: Department of Radiation Emergency Medicine, National Institute of Radiological Sciences, 4-9-1 Anagawa Inage-ku Chiba, 263-8555, Japan. akashi@nirs.go.jp
authors: Saori
authors: S
authors: Kawamura
authors: Kanae
authors: K
authors: Nishizawa
authors: Toshiyasu
authors: T
authors: Hirama
authors: Yutaka
authors: Y
authors: Noda
authors: Takeshi
authors: T
authors: Hiraoka
authors: Hisayoshi
authors: H
authors: Kondo
authors: Noriyuki
authors: N
authors: Yoshida
authors: Norihiro
authors: N
authors: Miyaushiro
authors: Misao
authors: M
authors: Hachiya
authors: Isamu
authors: I
authors: Hayata
authors: Makoto
authors: M
authors: Akashi
mesh_terms: D006801:Humans; D007564:Japan; D010315:Particle Accelerators; D018788:Radioactive Hazard Release; D011874:Radiometry; D014965:X-Rays