نتایج جستجو برای: mcnp x26

تعداد نتایج: 982  

Journal: :Journal of Nuclear Science and Technology 2000

Journal: :Journal of physics 2022

A Bremsstrahlung converter for medical apparatuses sterilization has been designed using tantalum and stainless-steel frame a high energy electron accelerator operating at an incident of 7.5 MeV. Optimization the x-ray spectra is investigated in this paper by adding beam hardening filter from copper, aluminum, stainless steel. The MCNP code used to simulate particle transport through design. To...

Journal: :The Review of scientific instruments 2016
C W Wink J A Frenje T J Hilsabeck R Bionta H Y Khater M Gatu Johnson J D Kilkenny C K Li F H Séguin R D Petrasso

A Magnetic Recoil Spectrometer (MRSt) has been conceptually designed for time-resolved measurements of the neutron spectrum at the National Ignition Facility. Using the MRSt, the goals are to measure the time-evolution of the spectrum with a time resolution of ∼20-ps and absolute accuracy better than 5%. To meet these goals, a detailed understanding and optimization of the signal and background...

2004
N. Tsujimura

The practical calibration rooms for neutron measuring devices are relatively small, where a large amount of room-reflected neutrons arise. Moreover the different structures of neutron irradiation apparatus influence the neutron spectrum and reference dose considerably. Therefore the influence of the neutron scattering was investigated in the three calibration rooms in different sizes and instal...

Journal: :Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine 2010
T Vidmar N Celik N Cornejo Díaz A Dlabac I O B Ewa J A Carrazana González M Hult S Jovanović M-C Lépy N Mihaljević O Sima F Tzika M Jurado Vargas T Vasilopoulou G Vidmar

Four general Monte Carlo codes (GEANT3, PENELOPE, MCNP and EGS4) and five dedicated packages for efficiency determination in gamma-ray spectrometry (ANGLE, DETEFF, GESPECOR, ETNA and EFFTRAN) were checked for equivalence by applying them to the calculation of efficiency transfer (ET) factors for a set of well-defined sample parameters, detector parameters and energies typically encountered in e...

Journal: :Acta Astronautica 2021

The Dragonfly mission to Titan is proposed use a radioisotope thermoelectric generator supply electrical and thermal power the spacecraft during flight once it arrives at its destination. As no continuously powered by an RTG has been flown down through Titan's atmosphere before, effects of such generator's radiation field on surrounding environment are unknown. MCNP (Monte Carlo N-Particle) sim...

ژورنال: :سنجش و ایمنی پرتو 0
مجتبی شمسایی ظفرقندی mojtaba shamsaie zafar ghandi amirkabir universityدانشگاه امیرکبیر پروین احمدی parvin ahmadi shahed universityدانشگاه شاهد

با استفاده از کد مونت کارلو (mcnp) می توان دزهای رسیده به اندام های حساس مانند شکم، پروستات، کبد و کلیه ها را در آزمایش براکی تراپی پروستات محاسبه کرد. بدین سبب که با افزایش دز رسیده به اندام های نزدیک پروستات، احتمال ابتلا به سرطان نیز افزایش می یابد، این تحقیق مهم و کاربردی خواهد بود. در این تحقیق با استفاده از کد mcnp 4c انرژی رسیده به این اندام ها با منابع رادیوایزوتوپ131cs ، 103pd و 125i م...

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