نتایج جستجو برای: neutron method

تعداد نتایج: 1672345  

Journal: :iranian journal of medical physics 0
mona zolfaghari department of physics, faculty of science, k. n. t university of technology, tehran, iran mahmood sedaghatizadeh department of physics, faculty of science, k. n. t university of technology, tehran, iran

introduction electron linear accelerator (linac) can be used for neutron production in boron neutron capture therapy (bnct). bnct is an external radiotherapeutic method for the treatment of some cancers. in this study, varian 2300 c/d linac was simulated as an electron accelerator-based photoneutron source to provide a suitable neutron flux for bnct. materials and methods photoneutron sources w...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1986
R M Snapka K Kwok J A Bernard O K Harling A Varshavsky

We describe approaches to neutron activation analysis and their application to post-separation autoradiographic detection of biological compounds. Specifically, we have extended the use of a "direct-labeling" method to the post-separation detection of DNA after gel electrophoresis and to the detection of nucleotides separated by TLC. In addition, we describe a more generally applicable "indirec...

2007
P. Kudejova J. Cizek R. Schulze J. Jolie B. Schillinger K. Lorenz M. Mühlbauer B. Masschaele M. Dierick J. Vlassenbroeck

6 NOTIZIARIO NEUTRONI E LUCE DI SINCROTRONE • Vol. 12 n. 2 July 2007 Abstract The aim of the ambitious ANCIENT CHARM project is the development of new imaging methods for a non-destructive analysis of archaeological objects using neutron beams: Neutron Resonant Capture Imaging, Prompt Gamma Activation Imaging and Neutron Diffraction Tomography. Together with the well-established Neutron Tomogra...

Journal: :iranian journal of radiation research 0
d. fatehi department of medical physics, faculty of medicine, shahrekord university of medical sciences, shahrekord, iran h. mozdarani department of medical genetics, faculty of medical sciences, tarbiat modares university,tehran, iran

background: to evaluate the effects of hyperthermia (ht) on the frequency of chromosomal aberrations induced by a low dose of neutron or γ-rays in human peripheral blood lymphocytes. materials and methods: blood samples were exposed to ht (41.5°c for 30 and 60min, 43°c for 15 and 30min), 10 cgy neutron or γ-rays, ht + neutron/γ, and neutron/γ + ht. after standard cell culture, harvesting, fixat...

2009
Kimberly A. Burns L. Eric Smith Christopher J. Gesh Mark W. Shaver

The accurate and efficient simulation of coupled neutron-photon problems is necessary for several important radiation detection applications. Examples include the detection of nuclear threats concealed in cargo containers and prompt gamma neutron activation analysis for nondestructive determination of elemental composition of unknown samples. In these applications, highresolution gamma-ray spec...

2006
J. Reijonen E. O. Lawrence

The Plasma and Ion Source Technology Group at Lawrence Berkeley National Laboratory has developed various types of advanced D-D (neutron energy 2.5 MeV), D-T (14 MeV) and T-T (0–9 MeV) neutron generators for wide range of applications. These applications include medical (Boron Neutron Capture Therapy), homeland security (Prompt Gamma Activation Analysis, Fast Neutron Activation Analysis and Pul...

D.V. Bandekas, E. Saitioti, J.G. Fantidis, N. Vordos,

Background: Boron Neutron Capture Therapy (BNCT) is a very promising treatment for patients suffering gliobastoma multiforme, an aggressive type of brain cancer, where conventional radiation therapies fail. Thermal neutrons are suitable for the direct treatment of cancers which are located at near-tissue-surface deep-seated tumors need harder, epithermal neutron energy spectra. Materials and Me...

2001
Gongyin Chen Richard C. Lanza

Fast neutron resonance radiography (NRR) has been devised as an elemental imaging method with applications such as contraband detection and mineral analysis. In NRR, a two-dimensional (2-D) elemental mapping of hydrogen, carbon, nitrogen, oxygen, and the sum of other elements is obtained from fast neutron radiographic images, taken at different neutron energies and chosen to cover the resonance...

Mina Zamani, Mohsen Bigdeli, Nariman Roohi

In the present work, we have obtained the equation of state for neutron star matter considering the in uence of the ferromagnetic and antiferromagnetic spin state. We have also investigated the structure of neutron stars. According to our results, the spin asymmetry stiens the equation of state and leads to high mass for the neutron star.

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