scholarly journals MAGIK: a Monte Carlo system for computing induced residual activation dose rates

1979 ◽  
Author(s):  
J. Barish ◽  
T.A. Gabriel ◽  
R.G. Jr. Alsmiller
Keyword(s):  
Monte Carlo ◽  
Dose Rates ◽  
Residual Activation

scholarly journals Field gamma spectrometry, Monte Carlo simulations and potential of non-invasive measurements

2012 ◽  
Vol 39 (1) ◽  
pp. 40-47 ◽  
Author(s):  
Guillaume Guérin ◽  
Norbert Mercier
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Dose Rate ◽  
Gamma Dose ◽  
Luminescence Dating ◽  
Gamma Dose Rate ◽  
Invasive Technique ◽  
Simple Method ◽  
Dose Rates ◽  
Non Invasive

Abstract The determination of gamma dose rates is of prior importance in the field of luminescence dating methods. In situ measurements are usually performed by the insertion of dosimeters or a portable gamma spectrometer cell in sediments. In this paper, Monte-Carlo simulations using the Geant4 toolkit allow the development of a new technique of insitu gamma dose rate evaluations: a spectrometer cell is placed on the surface of sediments under excavation to acquire successive spectra as sediments are removed by excavations. The principle of this non-invasive technique is outlined and its potential is discussed, especially in the case of environments in which radioelements are heterogeneously distributed. For such cases, a simple method to reconstruct gamma dose rate values with surface measurements using an attenuator is discussed, and an estimation of errors is given for two simple cases. This technique appears to be applicable, but still needs experimental validation.

scholarly journals In Vitro Comparison of Passive and Active Clinical Proton Beams

2020 ◽  
Vol 21 (16) ◽  
pp. 5650 ◽  
Author(s):  
Anna Michaelidesová ◽  
Jana Vachelová ◽  
Jana Klementová ◽  
Tomáš Urban ◽  
Kateřina Pachnerová Brabcová ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Code ◽  
Proton Beams ◽  
Biologically Relevant ◽  
Dose Rates ◽  
Medulloblastoma Cell Line ◽  
Significant Difference ◽  
Clonogenic Cell ◽  
In Vitro Comparison

Nowadays, the irradiation methodology in proton therapy is switching from the use of passively scattered beams to active pencil beams due to the possibility of more conformal dose distributions. The dose rates of active pencil beams are much higher than those of passive beams. The purpose of this study was to investigate whether there is any difference in the biological effectiveness of these passive and active irradiation modes. The beam qualities of double scattering and pencil beam scanning were measured dosimetrically and simulated using the Monte Carlo code. Using the medulloblastoma cell line DAOY, we performed an in vitro comparison of the two modes in two positions along the dose–deposition curve plateau and inside the Bragg peak. We followed the clonogenic cell survival, apoptosis, micronuclei, and γH2AX assays as biological endpoints. The Monte Carlo simulations did not reveal any difference between the beam qualities of the two modes. Furthermore, we did not observe any statistically significant difference between the two modes in the in vitro comparison of any of the examined biological endpoints. Our results do not show any biologically relevant differences related to the different dose rates of passive and active proton beams.

Electron and Beta Dose Rates of UO2 Pellet and Fuel Rod

2013 ◽  
Author(s):  
Guoqing Zhang ◽  
Xuexin Wang ◽  
Jiangang Zhang ◽  
Dajie Zhuang ◽  
Chaoduan Li ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Dose Rate ◽  
Radiation Protection ◽  
High Dose Rate ◽  
High Dose ◽  
Electron Dose ◽  
Dose Rates ◽  
Fuel Rod ◽  
Calculation Results ◽  
Beta Dose

The isotopes of uranium and their daughter nuclides inside the UO2 pellet emit mono-energetic electrons and beta rays, which generate rather high dose rate near the UO2 pellet and could cause exposure to workers. In this work calculations of electron dose rates have been carried out with Monte Carlo codes, MCNPX and Geant4, for a UO2 pellet and a fuel rod. Comparisons between calculations and measurements have been carried out to verify the calculation results. The results could be used to estimate the dose produced by electrons and beta rays, which could be used to make optimization for radiation protection purpose.

MCNP Simulation of In-Core Dose Rates for an Offline CANDU® Reactor

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Jordan G. Gilbert ◽  
Scott Nokleby ◽  
Ed Waller
Keyword(s):  
Monte Carlo ◽  
Dose Rate ◽  
Integrated Circuit ◽  
Multidisciplinary Team ◽  
Operating Conditions ◽  
Inspection System ◽  
Dose Rates ◽  
Pressure Tubes ◽  
Circuit Components ◽  
Safe Operating

Inspections of pressure tubes in CANDU® reactors are a key part of maintaining safe operating conditions. The current inspection system, the channel inspection and gauging apparatus for reactors (CIGAR), performs the job well but is limited by the fact that it can only inspect one channel at a time. A multidisciplinary team is currently developing a novel robotic inspection system. As part of this work, a Monte Carlo N-particle (MCNP) model has been developed in order to predict the dose rates that the improved inspection system will be exposed to and, from this, predict the component lifetime. This MCNP model will be capable of predicting in-core dose rates at any location within the reactor, and as such could be used for other situations where the in-core dose rate needs to be known. Based on estimates from this model, it is expected that at 7 days after shutdown, the improved inspection system could survive in core for approximately 7 h, providing it uses a tungsten shield 2.5 cm in thickness around the integrated circuit components. This is expected to be sufficient to perform a single inspection.

Global Evaluation of Prompt Dose Rates in ITER Using Hybrid Monte Carlo/Deterministic Techniques

2011 ◽  
Vol 60 (2) ◽  
pp. 676-680 ◽  
Author(s):  
A. M. Ibrahim ◽  
M. E. Sawan ◽  
S. W. Mosher ◽  
T. M. Evans ◽  
D. E. Peplow ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Global Evaluation ◽  
Hybrid Monte Carlo ◽  
Dose Rates

2D modelling: A Monte Carlo approach for assessing heterogeneous beta dose rates in luminescence and ESR dating: Paper ΙΙ, application to igneous rocks

2018 ◽  
Vol 48 ◽  
pp. 195-206 ◽  
Author(s):  
Fang Fang ◽  
Loïc Martin ◽  
Ian S. Williams ◽  
Frank Brink ◽  
Norbert Mercier ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Igneous Rocks ◽  
Esr Dating ◽  
Monte Carlo Approach ◽  
Dose Rates ◽  
2D Modelling ◽  
Beta Dose
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