نتایج جستجو برای: shielding materials
تعداد نتایج: 444083 فیلتر نتایج به سال:
A new class of auxetic materials, a hexachiral honeycomb structure with good mechanical properties, is investigated through computer simulation and measurement. The electromagnetic properties for shielding applications are taken into account. This new material shows some interesting EMC properties (e.g. -40dB transmittance @ 2.4GHz) and promises better performance using different insertion tech...
A low background Micromegas detector has been operating in the CAST experiment at CERN for the search of solar axions during the first phase of the experiment (2002-2004). The detector, made out of low radioactivity materials, operated efficiently and achieved a very low level of background rejection (5 × 10 −5 counts keV −1 cm −2 s −1) without shielding.
In this paper, investigated one of the way protecting information from its leakages through technical channels, such as shielding. The first part work mainly consider theoretical principles shielding, definition and process types, main task shield, highlighted concept shielding efficiency, presented dependence for calculating efficiency electromagnetic provided shields classification according ...
Introduction: Rectal and bladder cancer are the most common disease among young man. Although External Radiotherapy (EBRT) is one of the most effective treatment options introduced so far, the testis undesired radiation dose increases the risk of infertility and hormonal malfunctioning. The testicles are usually outside of the radiation field, but they can be exposed either to ...
Background: Biological shielding of nuclear reactors has always been a great concern and decreasing the complexity and expense of these installations is of great interest. In this study, we used datolite and galena (DaGa) minerals for production of a high performance heavy concrete. Materials and Methods: Datolite and galena minerals which can be found in many parts of Iran were used i...
as a result of being hydrogenous moderators, several landmine detection methods based onnuclear techniques have been suggested in recent years. because of elastic scattering and moderating neutrons from hydrogen atoms in landmines, detection of backscattered neutron shows an anomaly in the reflected thermal neutrons count when a detector scans over a mine. on landmine detection using neutron so...
Experimental study of concrete activation compared to MCNP simulations for safety of neutron sources
The neutron activation of shielding materials and the generated decay gamma radiation are well-known issues in terms occupational exposure. Though trace elements concretes can be dominant sources produced activity such cases, their concentrations often missing from input data shielding-related Monte Carlo simulations. For this reason, three concrete types were studied, that considered European ...
background: gonad shielding has been recommended during pelvic x-rays since the 1950s. the popular method of gonad shielding is placement a lead shield in the midline of the pelvis. the aim of this study was to evaluate the prevalence and utility of gonad shielding in pediatrics undergoing pelvic x-rays.materials and methodsfollowing study approval, we retrospectively retrieved data from the di...
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