نتایج جستجو برای: epithermal neutron
تعداد نتایج: 46585 فیلتر نتایج به سال:
Boron neutron capture therapy (BNCT) is a biochemically targeted radiotherapy based on the nuclear capture and fission reactions that occur when non-radioactive boron-10, which is a constituent of natural elemental boron, is irradiated with low energy thermal neutrons to yield high linear energy transfer alpha particles and recoiling lithium-7 nuclei. Clinical interest in BNCT has focused prima...
Parity nonconservation (PNC) was measured for 24 p-wave resonances from 8 to 300 eV in 232Th by measuring the helicity dependence of the total neutron cross section for epithermal neutrons with an improved experimental system. Ten resonances show statistically significant parity violation. For these ten resonances the analyzing powers are all positive, thus confirming the previously observed si...
Background & Aims : Hair follicle morphogenesis is controlled by complex reprocical ectodermal–mesenchymal interactions regulated by molecular mechanisms. In addition, glycoconjugates are known to be important for molecular interactions during developmental processes. The aim of this research was to study glcoconjugate terminal sugars distributions and changes during rat hair follicle morph...
In this article, we investigate the reliability of Google’s coral tensor processing units (TPUs) to both high-energy atmospheric neutrons (at ChipIR) and thermal from a pulsed source [at equipment materials mechanics analyzer (EMMA)] reactor Thermal Epithermal Neutron Irradiation Station (TENIS)]. We report data obtained with an overall fluence <inline-formula xmlns:mml="http://www.w3.org/1998/...
Abstract. Cosmic-ray neutron sensing (CRNS) allows for non-invasive soil moisture estimations at the field scale. The derivation of generally relies on secondary cosmic-ray neutrons in epithermal to fast energy ranges. Most approaches and processing techniques observed intensities are based assumption homogeneous site conditions or patterns with correlation lengths shorter than measurement foot...
Introduction: Recent results from gamma-ray and neutron spectrometers on Mars Odyssey indicate the presence of a hydrogen-rich layer tens of centimeters thick in the uppermost meter in high latitudes (>60 ̊) on Mars [1]. This hydrogen-rich layer correlates to regions of ice stability [2]. Thus, the subsurface hydrogen is thought to be water ice constituting 35+/15% by weight near the north and s...
This paper presents the status of studies on transmutation of minor actinides (MA) and long-lived fission products (LLFP) in a fast reactor at JNC, which includes four areas of work: (a) design studies, (b) nuclear data measurement and evaluation, (c) fuel fabrication and irradiation test, (d) strategy studies. It was found that the mixed hybrid MA-loading method, where Np nuclide is dispersed ...
The purpose of this clinical trial was to evaluate the utility of boron neutron capture therapy (BNCT) using epithermal neutrons for cases of recurrent cancer in the oral cavity, which are not indicated for a conventional treatment modality. We enrolled four patients with local recurrence or metastasis to the regional lymph nodes after completion of initial treatments, including surgery, chemot...
With a growing interest in the use of accelerator-based epithermal neutron sources for BNCT programs, in particular those based upon the Li(p ,n)Be reaction, there is a need to address the question of ‘‘what is the best proton energy to use?’’ This paper considers this question by using radiation transport calculations to investigate a range of proton energies from 2.15 to 3.5 MeV and a range o...
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