نتایج جستجو برای: ion chamber dosimetry gamma ray cobalt 60 iec 60731
تعداد نتایج: 951194 فیلتر نتایج به سال:
Recently a special parallel-plate ionization chamber was developed and characterized at the Instituto de Pesquisas Energéticas e Nucleares. The operational tests presented results within the recommended limits. In order to determine the influence of some components of the ionization chamber on its response, Monte Carlo simulations were carried out. The experimental and simulation results pointe...
The radiation response, quantified by the dose-log survival curve, of spores Bacillus pumilus subjected to irradiation in a 150 kV x-ray beam was examined and compared with response obtained reference cobalt-60 beam. were irradiated at doses ranging from 2 kGy 11 kGy. same for both qualities within measurement uncertainties. Combining these findings our previously published data, resistance B. ...
کسر جذب انرژی به¬ صورت نسبت مقدار انرژی جذب شده در یک ماده به مقدار انرژی گسیل شده از چشمه انرژی تعریف می¬ شود. در این پایان نامه با استفاده از کد محاسباتیmcnp، کسر جذب انرژی برای چندین هندسه متفاوت حاوی مواد گوناگون که چگالی همه آنها 1 در نظر گرفته شده محاسبه شده است. چشمه، پرتوهای گاما تابش می¬ کند و به¬ صورت نقطه¬ ای یا دارای توزیع یکنواخت است. انرژی چشمه از mev02/0 تا mev 75/2 متغیر است. کس...
We propose a new imaging gamma-ray detector in the MeV region. By measuring the directions and energies of not only a scattered gamma ray but also a recoil electron, the direction of an incident gamma ray would be essentially reconstructed event by event. Furthermore, one of two measured (zenith and azimuth) angles of a recoil electron gives us an additional redundancy which enables us to rejec...
In the current work, graphene oxide (GO) samples were prepared at room temperature from graphite flakes using a modified Hummer's method to produce metal-free electrocatalysts. The effect of the duration of the oxidation process on the structural, chemical and physical characteristics of the GO samples was evaluated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ...
Radiation dosimetry is used to quantify the dose delivered during radiation therapy by using ionization chambers with several correction factors. Knowledge of these factors is needed at well below the 1% level in order to maintain the overall uncertainty on the reference dosimetry near 1-2%. The small magnitude of the corrections renders measurements very difficult. Monte Carlo calculations are...
A cobalamin (Cbl) cofactor in corrinoid iron-sulfur protein (CoFeSP) is the primary methyl group donor and acceptor in biological carbon oxide conversion along the reductive acetyl-CoA pathway. Changes of the axial coordination of the cobalt ion within the corrin macrocycle upon redox transitions in aqua-, methyl-, and cyano-Cbl bound to CoFeSP or in solution were studied using X-ray absorption...
EGRET spark chamber data collected between 1991 April 22 and 1994 August 29 have been analyzed for gamma-ray burst events independent of BATSE triggering. To date, ve gamma-ray bursts that are coincident with a trigger from the BATSE instrument have been detected in the EGRET spark chamber. The EGRET-detected bursts have high energy power law tails and, in some cases, long duration emission. Be...
Various bacterial spores exhibited a wide range of radiation resistance to doses of 0.25 to 2.5 Mrad from a cobalt-60 radiation facility. Bacillus pumilus and Clos-tridium tetani were shown to have the highest degree of resistance when compared with other bacterial sporeformers. B. subtilis E163 was the least resistant of the bacterial spores studied. Dried spores contained on cellulose discs w...
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