نتایج جستجو برای: fast neutrons
تعداد نتایج: 248250 فیلتر نتایج به سال:
Calibration neutron fields have been developed at KAERI (Korea Atomic Energy Research Institute) to study the responses of commonly used neutron survey meters in the presence of fast neutrons of energy around 10 MeV. The neutron fields were produced by using neutrons from the (241)Am-Be sources held in a graphite pile and a DT neutron generator. The spectral details and the ambient dose equival...
Neutron has been one of the most interesting particle since its discovery. Being an uncharged it is more difficult to shield in comparison with other radiation types. This may be due differences interaction matter. The main processes neutron a matter via (n,p) reaction and thus hydrogenous materials are generally preferred neutron. In this study shielding properties for HAP composites have inve...
The modelling with the Geant4 toolkit of moderated 3He-filled proportional neutron counters is studied. The energy deposition spectra by the neutron capture products in the gas counter is compared with experimental results. On the other hand, efficiency calculation for polyethylene moderated proportional counters are compared with experimental and MCNPX results.Finally, the application of the G...
It is intended that deuterium-deuterium reaction experiments will be performed for the next phase of the large helical device (LHD) at National Institute for Fusion Science (NIFS), Toki, Japan. To protect workers against radiation, the characteristics of the radiation field at the LHD workplace should be evaluated. The neutron fluence at the workplace was calculated by means of the radiation tr...
several attributes that make it attractive as a model species. It has a short seed-to-seed generation time and abundant seed set. Extensive collections of M. truncatula ecotypes — natural geographic variants — exist, and mutant collections are readily produced by physical (fast neutron) and transposonmediated mutagenesis. M. truncatula is also host to Sinorhizobium meliloti, a rhizobium species...
Global maps of thermal and fast neutron fluxes from the moon suggest three end-member compositional units. A high thermal and low fast neutron flux unit correlates with the lunar highlands and is consistent with feldspathic rocks. The South Pole-Aitken basin and a strip that surrounds the nearside maria have intermediate thermal and fast neutron flux levels, consistent with more mafic rocks. Th...
Background: The trabecular bone changes in the tibia of C3H/HeN mice were measured 12 weeks after whole body irradiation with various doses of fast neutrons (0-2.4 Gy) or 137Cs-generated gamma-rays (0-6 Gy). Materials and Methods: Serum calcium, phosphorus, estradiol concentration and alkaline phosphatase activity were measured. Tibiae were anal...
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