نتایج جستجو برای: epithermal neutron
تعداد نتایج: 46585 فیلتر نتایج به سال:
Global distributions of thermal, epithermal, and fast neutron fluxes have been mapped during late southern summer/northern winter using the Mars Odyssey Neutron Spectrometer. These fluxes are selectively sensitive to the vertical and lateral spatial distributions of H and CO2 in the uppermost meter of the martian surface. Poleward of +/-60 degrees latitude is terrain rich in hydrogen, probably ...
At INFN LNL (Legnaro Italy) it has been built a high intensity Radio Frequency Quadrupole (RFQ) structure, able to produce a 5 MeV proton beam of 30 mA. Coupled with a Be target such a beam can generate a neutron flux of 1014 n/s, with a spectrum centred in the MeV region (that has been recently characterized in detail at LNL accelerators). This neutron flux can be moderated to generate a therm...
The important things in designing facilities for BNCT are to obtain neutron beams with appropriate energy spectrum and intensity for efficient treatment. In recent years, at several universities, accelerator-based BNCT facilities were designed, which are composed of target and beam shaping assembly to generate epithermal neutron beams[1]. As a previous study, target system[2][3] and a beam shap...
With the completion of the fission converter epithermal neutron beam (FCB) at MIT, which has a higher epithermal neutron flux (1.3 x 1010 neutrons/cm 2sec) than the current m-67 beam, future BNCT irradiations conducted by the Harvard-MIT BNCT program could be reduced from approximately 3 hours per beam to just a few minutes. Therefore, it is essential to determine the optimal time after BPA adm...
As clinical trials of Neutron Capture Therapy (NCT) are initiated in the U.S. and other countries, new treatment planning codes are being developed to calculate detailed dose distributions in patient-specific models. The thorough evaluation and comparison of treatment planning codes is a critical step toward the eventual standardization of dosimetry, which, in turn, is an essential element for ...
Introduction. Orbital mapping of induced neutrons and gamma-rays by Odyssey has recently successfully proven the applicability of nuclear methods for studying of the elementary composition of Martian upper-most subsurface. In particular, the suite of Gamma-Ray Spectrometer (GRS) has discovered the presence of large water-ice rich regions southward and northward on Mars [1-3]. The data of neutro...
Based on a study of high-energy epithermal (HEE) neutrons in data from the Lunar Exploration Neutron Detector (LEND) on NASA's Lunar Reconnaissance Orbiter (LRO), the background from HEE neutrons is larger than initially estimated. Claims by Mitrofanov et al. (Reports, 22 October 2010, p. 483) of enhanced hydrogen abundance in sunlit portions of the lunar south pole and quantitative hydrogen co...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید