نتایج جستجو برای: neutron method

تعداد نتایج: 1672345  

Journal: :American journal of physiology. Heart and circulatory physiology 2001
C P Reinhardt S Dalhberg M A Tries R Marcel J A Leppo

Neutron activation is an accurate analytic method in which trace quantities of isotopes of interest in a sample are activated and the emitted radiation is measured with high-resolution detection equipment. This study demonstrates the application of neutron activation for the measurement of myocardial perfusion using stable isotopically labeled microspheres. Stable labeled and standard radiolabe...

Journal: :CoRR 2015
Sukanta Nayak Snehashish Chakraverty

Fuzzy finite element solution of uncertain neutron diffusion equation for imprecisely defined homogeneous triangular bare reactor S. Nayak and S. Chakraverty * Department of Mathematics, National Institute of Technology, Rourkela, Odisha -769008, India Abstract: Scattering of neutron collision inside a reactor depends upon geometry of the reactor, diffusion coefficient and absorption coefficien...

Journal: :Clinical chemistry 1971
H D Livingston

A method is described for measuring the concentration of calcium in arterial tissue by neutron activation analysis. The principal advantage is that the method is nondestructive and is ideal for analytical situations in which multiple biochemical measurements are required on a few-milligram sample. Application of the method is illustrated here by a study of aortic calcium metabolism in pigeons a...

2014
Dimitrios Psaltis Feryal Özel Deepto Chakrabarty

Modeling the amplitudes and shapes of the X-ray pulsations observed from hot, rotating neutron stars provides a direct method for measuring neutron-star properties. This technique constitutes an important part of the science case for the forthcoming NICER and proposed LOFT X-ray missions. In this paper, we determine the number of distinct observables that can be derived from pulse profile model...

Journal: :The Review of scientific instruments 2014
L Giacomelli S Conroy G Gorini L Horton A Murari S Popovichev D B Syme

The Joint European Torus (JET, Culham, UK) is the largest tokamak in the world devoted to nuclear fusion experiments of magnetic confined Deuterium (D)/Deuterium-Tritium (DT) plasmas. Neutrons produced in these plasmas are measured using various types of neutron detectors and spectrometers. Two of these instruments on JET make use of organic liquid scintillator detectors. The neutron emission p...

Journal: :تابش و فناوری هسته ای 0
سید مهدی تیموری سندسی گروه فیزیک، دانشگاه گیلان، رشت، گیلان، ایران عباس قاسمی زاد گروه فیزیک، دانشگاه گیلان، رشت، گیلان، ایران

in this work, we had examined 7 different types of neutron sources -an isotropic point source, sending 14.1(mev) monoenergetic neutrons ,an spherical source with 30 micron radius sending 14.1 (mev) monoenergetic neutrons, and a 30 micron radius spherical source having gaussian fusion energy spectrum from a d-t fusion, with different bandwidths -1,10,50,100 and 1000 kev and investigated 5 differ...

Journal: :مجله دانشگاه علوم پزشکی شهرکرد 0
داریوش فاتحی daryoush fatehi

due to importance of combination therapies in cancer treatment, this study was performed to find the effects of hyperthermia and neutron irradiation and heir combination on the human lymphocytes. blood samples were treated separately with 41.5 °c for 30 and 60 minutes, 43 °c for 15 and 30 minutes, as well as 10 cgy neutron irradiation. they also treated with hyperthermia followed by irradiation...

Journal: :Physical review letters 2013
Aurel Bulgac Michael McNeil Forbes Rishi Sharma

We present an efficient and general method to compute vortex-pinning interactions--which arise in neutron stars, superconductors, and trapped cold atoms--at arbitrary separations using real-time dynamics. This method overcomes uncertainties associated with matter redistribution by the vortex position and the related choice of ensemble that plague the typical approach of comparing energy differe...

Journal: :iranian journal of radiation research 0
s.m.r. aghamiri radiation medicine department, shahid beheshti university, tehran, iran s.m.j. mortazavi medical physics department, school of medicine, shiraz university of medical sciences, shiraz, iran m.a. mosleh shirazi physics unit, radiotherapy department, shiraz university of medical sciences, shiraz, iran m. baradaran-ghahfarokhi medical physics and medical engineering department, school of medicine, isfahan university of medical sciences, isfahan, iran f. rahmani department of physics, knt university of technology, tehran, iran a. amiri chemical engineering department, new mexico state university, las cruces, new mexico, usa

background: high density concrete is extensively used for efficient radiation attenuation in radiotherapy rooms and nuclear reactors. over the past eight years, some efficient galena-based concrete samples for shielding x or gamma rays was produced. the goal of this study was to produce a novel high density concrete against neutron and photon radiations using tourmaline and galena. materials an...

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