منابع مشابه
Personnel Hazards from Medical Electron Accelerator Photoneutrons "
PERSONNEL HAZARDS FROM MEDICAL ELECTRON ACCELERATOR PHOTONEUTRONS" R. C. McCall, T. M. Jenkins, R. A. Shore and P. D. LaRiviere+ Stanford Linear Accelerator Center, CA, U.S.A. and Varian Associates? INTRODUCTION For medical accelerators, neutron penetration through the room entry door is the major personnel hazard. Most therapy accelerator rooms are designed with at least a rudimentary maze to ...
متن کاملMev X rays and photoneutrons from femtosecond laser-produced plasmas.
We demonstrate a novel method to monitor the total angular distribution of the spectrum of hard x-ray emission from a plasma generated with femtosecond laser pulses with an intensity of 5 x 10(18) W/cm2 on a solid target. Measured and calculated angular distributions of x rays show a pronounced anisotropy for MeV photon energies. We complemented the spectral information by demonstrating a (gamm...
متن کاملPhotoneutrons from medical linear accelerators--radiobiological measurements and risk estimates.
PURPOSE To assess the oncogenic potential of the photoneutrons produced by high energy medical linear accelerators. METHODS AND MATERIALS An established line of cells of rodent origin (C3H 10T1/2) was used to assess the oncogenic potential of the radiation dose received in the breast of an anthropomorphic "randoman" phanton, while the cervix received a dose of 70 Gy. Experiments were performe...
متن کاملMagnesium bioavailability from magnesium citrate and magnesium oxide.
This study compared magnesium oxide and magnesium citrate with respect to in vitro solubility and in vivo gastrointestinal absorbability. The solubility of 25 mmol magnesium citrate and magnesium oxide was examined in vitro in solutions containing varying amounts of hydrochloric acid (0-24.2 mEq) in 300 ml distilled water intended to mimic achlorhydric to peak acid secretory states. Magnesium o...
متن کاملDoses to patients from photoneutrons emitted in a medical linear accelerator.
This study of doses to patients from emitted photoneutrons in a medical linear accelerator (Varian 2100C) was carried out. Dose calculation was performed using Monte Carlo Geant4 code. The model was used to calculate the neutron fluence, as a function of the neutron energy inside the treatment room to estimate the effective dose to patients. The ambient dose equivalent versus field size for pat...
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ژورنال
عنوان ژورنال: Australian Journal of Physics
سال: 1958
ISSN: 0004-9506
DOI: 10.1071/ph580273