نتایج جستجو برای: آشکارساز 39 cr
تعداد نتایج: 142907 فیلتر نتایج به سال:
Solid-state nuclear track detectors, such as CR-39, are widely used in physics and in many inertial confinement fusion (ICF) experiments. In the ICF experiments, the particles of interest, such as D(3)He-protons, have ranges of order of the detector thickness. In this case, the dynamic range of the detector can be extended by recording data on both the front and back sides of the detector. High...
آشکار سازهای cr-39 بصورت وسیع در اندازگیری گاز رادن و دختران آن در هوا مورد استفاده قرار میگیرند . سعی شده است که با استفاده از شبیه سازی مونت کارلو امکان استفاده مستقیم cr-39 برای اندازگیری رادن و دختران آن در آب بررسی شود . باتصادفی فرض کردن موقعیت وزاویه ارسال ذرات آلفای رادن ودختران آن ضریب حساسیت آشکار ساز cr-39 در هوا , آب, هگزان,روغن زیتون و سیکلوهگزان محاسبه شده است. استفاده از cr-39 در...
نوترون، دارای طیف انرژی پیوسته و معمولاً به صورت مختلط با فوتون ها وسایر پرتوهای موجود می باشد، بنابراین طراحی و ساخت آشکارسازی که بتواند به طیف وسیع انرژی نوترون پاسخ مناسبی داشته باشد، بسیار دشوار و مسئله اساسی در بحث دزیمتری وآشکارسازی نوترون است. در این پایان نامه از دو آشکارساز نوترونی، فیلم پلیمری cr-39 و کارتهایtldچهار قرص نوترون-گاما به منظور دزیمتری نوترون استفاده می شود. در آشکارساز پل...
Presently, CR-39 Solid State Nuclear Track Detectors (SSNTD) is being used for Fast Neutron Personnel Monitoring in India. Individual detectors are cut manually from CR-39 sheets. Laser-cutting of the sheets will ensure precision and also save on the laborious efforts involved in sheet cutting. It was observed that there is a slight increase in background tracks due to laser-cutting. Studies we...
Computer programs have been developed to calculate track parameters and to plot track openings and wall pro$les. The programs are based on equations derived for three-dimensional consideration of track development. All possible cases of track openings and wall pro$les are obtainable from these equations. Results are given for lengths of major and minor axes, track depths and surface areas of tr...
Pinhole imaging of large (mm scale) carbon-deuterium (CD) plasmas by proton self-emission has been used for the first time to study the microphysics of shock formation, which is of astrophysical relevance. The 3 MeV deuterium-deuterium (DD) fusion proton self-emission from these plasmas is imaged using a novel pinhole imaging system, with up to five different 1 mm diameter pinholes positioned 2...
Hybrid composites of CdSe nanocrystals embedded in allyl diglycol carbonate (CR39) matrices have been prepared and characterized. The measurements show that the linear refractive index of the composite decreases as the CdSe nanocrystal’s weight-percentage concentration increases at the laser wavelengths of 632.8 nm and 532 nm. The room temperature nonlinear optical properties of the hybrid comp...
PURPOSE Many impact tests fail to rigorously analyze the polymer behavior at impact, because they are performed in an energy range too different from real-life incidents, use specimens with other geometries than those of their final application, or they do not take in account polymer viscoelastic nature. A novel low energy impact method that overcomes current method limitations is presented for...
Due to the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, the evacuees from Namie Town still cannot reside in the town, and some continue to live in temporary housing units. In this study, the radon activity concentrations were measured at temporary housing facilities, apartments and detached houses in Fukushima Prefecture in order to estimate the annual internal exposure dose of resid...
Eight or 9 groups of researchers have reported that transmutation experiments are associated with the emission of anomalous objects that cause anomalous markings. Since the year 2000, Urutskoev et al., Savvatimova, Ivoilov, and Adamenko have published similar results, and several scientists are speculating that these emitted objects are Lochak monopoles. Plastic targets like CR-39 and nuclear e...
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