نتایج جستجو برای: photon contamination

تعداد نتایج: 123271  

ژورنال: سنجش و ایمنی پرتو 2020

Radiotherapy using linear accelerators is known as an effective modality for cancer treatment. The photons energy of treatment beams significantly affect the dose distribution. Therefore, it is important to accurately evaluate the photon energy spectra. In this study, MCNPX Monte Carlo code (version 2.6.0) was used to simulate an 18 MV photon beam of a Varian 2100C/D linear accelerator. By matc...

آروندی, شعله, طهماسبی بیرگانی, محمد جواد, بهروز, محمد علی, طبری جویباری, راحله, طهماسبی, مرضیه,

Background and purpose: Electron beams are extensively used in superficial cancer therapy. Unlike photon therapy, percentage depth dose curves (PDD) do not specify a maximum point in high energy electron therapy and include a depth range. The aim of this study was to obtain PDD by an analytical formulation which can be helpful to acquire the size of treatment area and other treatment factors su...

Journal: :Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association 2011
Brendan D Masini Daniel J Stinner Scott M Waterman Joseph C Wenke

PURPOSE The purpose of this study was to evaluate the bacterial adherence to high--tensile strength suture materials using a bioluminescent in vitro model. METHODS Eleven strands each of No. 2 MaxBraid (Arthrotek [Biomet], Warsaw, IN), FiberWire (Arthrex, Naples, FL), Ethibond (Ethicon, Somerville, NJ), Orthocord (DePuy Mitek, Raynham, MA), and silk (Ethicon) sutures were immersed in a broth ...

Journal: :AIP Advances 2021

Our study shows that deposited Ge and Si dielectric thin-films can exhibit low microwave losses at near single-photon powers sub-Kelvin temperatures ($\approx$40 mK). This loss enables their use in a wide range of devices, including low-loss coplanar, microstrip, stripline resonators, as well layers for device isolation, inter-wiring dielectrics, passivation Josephson junction circuit fabricati...

Journal: :Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2015
Loren G Miller Samantha J Eells Michael Z David Nancy Ortiz Alexis R Taylor Neha Kumar Denise Cruz Susan Boyle-Vavra Robert S Daum

BACKGROUND Many patients suffer from recurrent Staphylococcus aureus infections, but there are few data examining recurrence predictors. METHODS We followed adults and children after treatment for S. aureus skin infections and their household contacts in Los Angeles and Chicago. We surveyed subjects for S. aureus body colonization, household fomite contamination, and behavioral and clinical f...

2013
Christopher L. Deufel John A. Antolak

A total skin electron (TSE) floor technique is presented for treating patients who are unable to safely stand for extended durations. A customized flattening filter is used to eliminate the need for field junctioning, improve field uniformity, and reduce setup time. The flattening filter is constructed from copper and polycarbonate, fits into the linac's accessory slot, and is optimized to exte...

Journal: :Physics in medicine and biology 2004
Antonio Lopez Medina Antonio Teijeiro Francisco Salvador Daniela Medal Julio Vazquez Manuel Salgado María C Carrion

Two dosimetry protocols based on absorbed dose to water have recently been implemented: TG-51 and TRS-398. These protocols use different beam-quality indices: %dd(10)x and TPR20,10. The effect of electron contamination in measurements of %dd(10)x has been proposed as a disadvantage of the TG-51. For actual measurements of %dd(10)x in five clinical beams (Primus 6-18 MV, SL-75/5 6 MV, SL-18 6-15...

2014
Isheeta Seth Jeffrey L. Schwartz Robert D. Stewart Robert Emery Michael C. Joiner James D. Tucker

Bystander effects have been observed repeatedly in mammalian cells following photon and alpha particle irradiation. However, few studies have been performed to investigate bystander effects arising from neutron irradiation. Here we asked whether neutrons also induce a bystander effect in two normal human lymphoblastoid cell lines. These cells were exposed to fast neutrons produced by targeting ...

2014
So-Yeon Park Beom Seok Ahn Jong Min Park Sung-Joon Ye Il han Kim Jung-in Kim

BACKGROUND In this study, dosimetric aspects of TSEI consisting of a 4 MeV beam with no spoiler were investigated in comparison to a nominal 6 MeV beam with spoiler, and the potential for clinical applications was evaluated. METHODS The TSEI technique is based on the Stanford technique, which utilizes a beam configuration of six-dual fields. MOSFETs were used to measure the optimal gantry ang...

Journal: :iranian journal of science and technology (sciences) 2011
m. m. golshan

in this work we investigate the thermal entanglement between two-level atoms and photons in a nonlinear cavity. we consider intensity-dependent couplings and calculate the negativity, as a measure of atom-photonentanglement. the cavity is assumed to be at a temperature t, so that all number of photons, and at the same time, both atomic states, with definite probabilities, are present. we then d...

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