نتایج جستجو برای: bf3 detector
تعداد نتایج: 59041 فیلتر نتایج به سال:
One of the most important instruments in gamma ray spectroscopy is HPGe detector. Concept of virtual point detector was considered for Ge(Li) detector. On the basis of this concept, there is a point inside a Ge detector that can be regarded as a fictitious point detector hosting all the interactions. If there is really a point whose response can be considered similar to that of the whole real b...
The operation of a high energy particle accelerator facility is accompanied by neutron fields which are widely distributed in energy. As the neutron component dominates the dose outside the shielding neutron dose meters are needed for monitoring the radiation level at beam lines and experimental areas which can be accessed by personnel. For this purpose the so-called neutron rem-counter of the ...
Research for a reliable solid-form semiconductor neutron detector continues because such a device would have greater efficiency, in a compact form, than present day gas-filled He and BF3 detectors. The Li(n,t)He reaction yields a total Q value of 4.78 MeV, larger than B, and easily identified above background radiations. Hence, devices composed of either natural Li (nominally 7.5% Li) or enrich...
The acid catalyzed reaction is one of the most important reactions in organic chemistry. Most have been studied presence strong acids such as H2SO4, HNO3, HCl, BF3.O(Et)2, TFA, and methanesulfonic etc. various solvents. use excessive even stoichiometric amounts with solvents raises environmental concerns. To avoid corrosive to reduce impact, development a new method for synthesis by boric would...
The neutron collision cross-section is important in neutron use for a specific job, such as neutron therapy or even in nuclear reactors. In calculating computational codes such as MCNP, only information from the neutron-to-mass collision information contained in the computational code library is used, in the case of nanoscale particles in contrast to the mass of materials and / or particulate m...
The purpose of this study is to select the best place for the detector towards shield and the gamma source which have the least flux buildup factor of the photon. In this research, the flux buildup factor of gamma rays was calculated by using of MCNP-4C code for cylindrical sources 137Cs, 60Co, 16N coaxial shields made up of aluminum, iron and lead with a constant thickness 1.55 cm in detec...
The aim of this study was to compare the fatigue resistance of restored teeth with bulk fill composite resin, conventional composite resin with incremental insertion and unprepared sound teeth. Twenty-eight extracted maxillary premolars were selected and divided into 4 groups based on composite resin and insertion technique: control (C), conventional composite resin with incremental insertion (...
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