51 research outputs found
Fast Neutron Detection with 6Li-loaded Liquid Scintillator
We report on the development of a fast neutron detector using a liquid
scintillator doped with enriched Li-6. The lithium was introduced in the form
of an aqueous LiCl micro-emulsion with a di-isopropylnaphthalene-based liquid
scintillator. A Li-6 concentration of 0.15 % by weight was obtained. A 125 mL
glass cell was filled with the scintillator and irradiated with fission-source
neutrons. Fast neutrons may produce recoil protons in the scintillator, and
those neutrons that thermalize within the detector volume can be captured on
the Li-6. The energy of the neutron may be determined by the light output from
recoiling protons, and the capture of the delayed thermal neutron reduces
background events. In this paper, we discuss the development of this 6Li-loaded
liquid scintillator, demonstrate the operation of it in a detector, and compare
its efficiency and capture lifetime with Monte Carlo simulations. Data from a
boron-loaded plastic scintillator were acquired for comparison. We also present
a pulse-shape discrimination method for differentiating between electronic and
nuclear recoil events based on the Matusita distance between a normalized
observed waveform and nuclear and electronic recoil template waveforms. The
details of the measurements are discussed along with specifics of the data
analysis and its comparison with the Monte Carlo simulation
Measuring progress and projecting attainment on the basis of past trends of the health-related Sustainable Development Goals in 188 countries: an analysis from the Global Burden of Disease Study 2016
The UN’s Sustainable Development Goals (SDGs) are grounded in the global ambition of “leaving no one behind”. Understanding today’s gains and gaps for the health-related SDGs is essential for decision makers as they aim to improve the health of populations. As part of the Global Burden of Diseases, Injuries, and Risk Factors Study 2016 (GBD 2016), we measured 37 of the 50 health-related SDG indicators over the period 1990–2016 for 188 countries, and then on the basis of these past trends, we projected indicators to 2030
Applied field/frequency dependency of propagation in axially magnetised ferrite waveguides
El presente artículo pretende analizar la violencia simbólica a la luz de los conocimien- tos, actitudes y prácticas que el personal de salud posee en torno a la atención de muje- res en edad mediana que experimentan la menopausia. A nivel metodológico, se planteó un estudio exploratorio-descriptivo, en el cual se utilizó el método de encuesta CAP (Conocimientos, Actitudes y Prácticas). Tal aproximación identificó como hallazgo princi- pal, la necesidad de promover una ruptura paradigmática respecto a la visión tradicional del cese menstrual y a la manera en que su abordaje ha sido concebido
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