Bremsstrahlung Produced in Thick Aluminum and Iron Targets by 0.5 to 2.8 MeV Electrons

Dance, W. E.; Rester, D. H.; Farmer, Benjamin; Johnson, James A.; Baggerly, L. L.

doi:10.1063/1.1656689

Cited by 23 publications

(10 citation statements)

References 7 publications

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“…As mentioned above, data from Refs. [14,15] were used in this work to validate the physics results provided by the Geant4 code. Geant4 [7,8] is a general-purpose toolkit for the Monte Carlo simulation of the propagation of particles in matter.…”

Section: The Monte Carlo Simulation With Geant4mentioning

confidence: 99%

Validation of the Geant4 simulation of bremsstrahlung from thick targets below 3 MeV

Pandola

Andenna

Caccia

2015

Nuclear Instruments and Methods in Physics Research Section B:

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The bremsstrahlung spectra produced by electrons impinging on thick targets are simulated using the Geant4 Monte Carlo toolkit. Simulations are validated against experimental data available in literature for a range of energy between 0.5 and 2.8 MeV for Al and Fe targets and for a value of energy of 70 keV for Al, Ag, W and Pb targets. All three independent sets of electromagnetic models available in Geant4 to simulate bremsstrahlung are tested. A quantitative analysis is performed reproducing with each model the energy spectrum for the different configurations of emission angles, energies and targets. At higher energies (0.5-2.8 MeV) of the impinging electrons on Al and Fe targets, Geant4 is able to reproduce the spectral shapes and the integral photon emission in the forward direction. The agreement is within 10-30%, depending on energy, emission angle and target material. The physics model based on the Penelope Monte Carlo code is in slightly better agreement with the measured data than the other two. However, all models over-estimate the photon emission in the backward hemisphere. For the lower energy study (70 keV), which includes higher-Z targets, all models systematically under-estimate the total photon yield, while still providing a reasonable agreement between 10 and 50%. The results of this work are of potential interest for medical physics applications, where knowledge of the energy spectra and angular distributions of photons is needed for accurate dose calculations with Monte Carlo and other fluence-based methods.

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Section: The Monte Carlo Simulation With Geant4mentioning

confidence: 99%

Validation of the Geant4 simulation of bremsstrahlung from thick targets below 3 MeV

Pandola

Andenna

Caccia

2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…11 to Fig. 15 show the differential Bremsstrahlung cross section resulting from 500 keV electrons impinging onto an aluminum target of thickness 0.548 g/cm 2 ; the corresponding experimental data are from [13]. The 2BN angular distribution generator available in the Low Energy Electromagnetic package exhibits the best agreement: in fact, as documented in [7], this model is especially motivated by a precise description of the Bremsstrahlung process at low energies.…”

Section: Methods Of the Studymentioning

confidence: 68%

“…16 Differential Bremsstrahlung cross section; the red points are data in [13], the black ones are Geant4 simulation results; the empty symbols correspond to an Al target, the solid ones to a Fe target. …”

Section: Energy (Mev)mentioning

confidence: 99%

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Validation of Geant4 Bremsstrahlung models: first results

Chauvie

Guatelli

Mascialino

et al. 2006

2006 IEEE Nuclear Science Symposium Conference Record

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A project is in progress for a systematic, rigorous validation of Geant4 electromagnetic physics. This paper presents the first results concerning the validation of Geant4 bremsstrahlung models against experimental data. Abstract-A project is in progress for a systematic, rigorous validation of Geant4 electromagnetic physics. This paper presents the first results concerning the validation of Geant4 Bremsstrahlung models against experimental data.

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“…Each angle is the average of ±5° around it. In order to validate the results, the first simulation was compared to the spectrum of 2.8 MeV electrons hitting an iron target as measured by Dance [15]. Three emission angles were selected for comparison (10°, 45°, 120°); as can be seen in Figure 2, the results showed a good agreement.…”

Section: Icrs-13 and Rpsd-2016mentioning

confidence: 85%

Shielding calculations for industrial 5/7.5MeV electron accelerators using the MCNP Monte Carlo Code

Peri¹,

Orion

2017

EPJ Web Conf.

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Abstract..High energy X-rays from accelerators are used to irradiate food ingredients to prevent growth and development of unwanted biological organisms in food, and by that extend the shelf life of the products. The production of X-rays is done by accelerating 5 MeV electrons and bombarding them into a heavy target (high Z). Since 2004, the FDA has approved using 7.5 MeV energy, providing higher production rates with lower treatments costs. In this study we calculated all the essential data needed for a straightforward concrete shielding design of typical food accelerator rooms. The following evaluation is done using the MCNP Monte Carlo code system: (1) Angular dependence (0-180°) of photon dose rate for 5 MeV and 7.5 MeV electron beams bombarding iron, aluminum, gold, tantalum, and tungsten targets. (2) Angular dependence (0-180°) spectral distribution simulations of bremsstrahlung for gold, tantalum, and tungsten bombarded by 5 MeV and 7.5 MeV electron beams. (3) Concrete attenuation calculations in several photon emission angles for the 5 MeV and 7.5 MeV electron beams bombarding a tantalum target. Based on the simulation, we calculated the expected increase in dose rate for facilities intending to increase the energy from 5 MeV to 7.5 MeV, and the concrete width needed to be added in order to keep the existing dose rate unchanged.

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Bremsstrahlung Produced in Thick Aluminum and Iron Targets by 0.5 to 2.8 MeV Electrons

Cited by 23 publications

References 7 publications

Validation of the Geant4 simulation of bremsstrahlung from thick targets below 3 MeV

Validation of the Geant4 simulation of bremsstrahlung from thick targets below 3 MeV

Validation of Geant4 Bremsstrahlung models: first results

Shielding calculations for industrial 5/7.5MeV electron accelerators using the MCNP Monte Carlo Code

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