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...

Brass mesh bolus has been shown to be an acceptable substitute for tissue-equivalent bolus to increase superficial dose for chest wall tangent photon radiotherapy. This work investigated the increase in surface dose, the change in the dose at depth, and the safety implications of higher energy photon beams when using brass mesh bolus for postmastectomy chest wall radiotherapy. A photon tangent ...

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...

BACKGROUND High-energy linear accelerator (linac) is a valuable tool and the most commonly used device for external beam radiation treatments in cancer patients. In the linac head, high-energy photons with energies above the threshold of (γ,n) interaction produce photoneutrons. These photoneutrons deliver the extra dose to the patients undergoing radiation treatment and increase the risk of sec...

A new experiment configuration was designed, developed, and implemented to measure photoneutron yields using the Rensselaer Polytechnic Institute (RPI) electron linear accelerator (LINAC) at RPI Gaerttner LINAC Center. The includes a target assembly that converts beam into high energy bremsstrahlung photon flux incident upon sample material of interest. photons excite nuclei in interest, which ...

Relevance. The photofission of shielded nuclear materials is widely used to develop methods for non-destructive analysis their isotopic composition. To stimulate the reaction, bremsstrahlung beams obtained on electronic accelerators are used. Their parameters significantly depend design features and sample activation schemes. Purpose. Theoretical modelling an optimal scheme stimulating accelera...

CALCULATIONS OF THE GIANT-DIPOLE-RESONANCE PHOTONEUTRONS USING A COUPLED EGS4-MORSE CODE J. C. Liu, W. R. Nelson, K. R. Kase and X. S. Mao Stanford Linear Accelerator Center, P. 0. Box 4349, Stanford, CA 94309 Abstract The production and transport of the photoneutrons from the giant-dipoleresonance reaction have been implemented in a coupled EGS4-MORSE code. The total neutron yield (including b...