نتایج جستجو برای: neutron activation
تعداد نتایج: 471710 فیلتر نتایج به سال:
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...
Precise calibration of energy and efficiency of gamma spectrometry systems for different geometries is very important. In most cases, preparation of these sources for educational and research centers is very difficult due to high costs and lack of access to the reactor. The purpose of this paper is to explain the procedure for production of calibration sources 65Zn and 60Co using instrumental ...
Neutron Activation Analysis Prognosis and Optimization (NAAPRO) code was applied for the prognosis of activation products, their activities, number counts recorded in detector, minimum detection limits as well gamma spectrum obtained fast neutron analysis experiments. Simulations were performed geological biological reference materials irradiated with 14 MeV neutrons at 5.5 MV NCSRD tandem acce...
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...
Neutron activation cross sections for Bi and Co at 386 MeV were measured by activation method. A quasi-monoenergetic neutron beam was produced using the (7)Li(p,n) reaction. The energy spectrum of these neutrons has a high-energy peak (386 MeV) and a low-energy tail. Two neutron beams, 0° and 25° from the proton beam axis, were used for sample irradiation, enabling a correction for the contribu...
The epithermal neutron beam model of the Finnish boron neutron capture therapy (BNCT) facility (FiR 1) was created using the two-dimensional (2D) discrete ordinates transport (DORT) code. The final design of the beam was achieved using the DORT model: the optimal thickness of the neutron moderator and the length and the thickness of the bismuth collimator of the beam were calculated. The final ...
Neutron activation analysis with dysprosium as a tracer was employed to determine quantitatively the microleakage around the restorations of an experimental hydrophobic composite, as well as a commercial composite. Only a negligible uptake of tracer was obtained for the experimental composite, whereas a five-fold uptake was recorded for the commercial composite. Capillary penetration of fluid a...
We are developing a miniature neutron-alpha activation spectrometer for in-situ analysis of chem-bio samples, including rocks, fines, ices, and drill cores, suitable for a lander or Rover platform for Mars or outer-planet missions. In the neutron-activation mode, penetrating analysis will be performed of the whole sample using a y spectrometer and in the ex-activation mode, the sample surface w...
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