Simulation study on radiation fields around targets to apply CR-39 for photo-neutron measurement in electron accelerator near the threshold energy

Sahoo, G.S.; Tripathy, S.P.; Kulkarni, M.S.

doi:10.1016/j.apradiso.2021.110080

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…In the case of interaction of electrons (Ee=17.5 MeV) with a W converter with a thickness of 5 mm [4], the resulting secondary photoneutrons can additionally initiate channels of neutron fission reactions (n,f) of nuclear materials, since their cross-sections (for the energy region of fast neutrons, which are the main components of the energy spectra of photoneutrons [9]) are approximately several times larger than the cross-sections of photofission reactions [31], which can affect the accuracy of the analysis of their isotopic composition. Therefore, when activating samples of nuclear materials on a linear accelerator [4], a combined filter was used to purify the bremsstrahlung beam from the photoneutrons present in it, generated by the interaction of electrons (Ee=17.5 MeV) with the W converter and additionally generated by interaction with the Pb collimator.…”

Section: Comparison With the Experimentsmentioning

confidence: 99%

“…The outputs of bremsstrahlung photons and their energy spectra obtained by converting electron beams into bremsstrahlung (via the (e,γ) reaction channel) depend primarily on the initial electron energy, characteristics (material, geometric dimensions) of converters [8][9][10]. The electron spans in the materials from which the converters are made will be greater than the thickness at which the photon outputs have maximum values, i.e., residual electrons will be present in the beams [11].…”

Section: Introductionmentioning

confidence: 99%

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Optimal scheme for stimulating photofission of shielded nuclear materials on the Microtron M-30: a combination of theoretical and experimental studies

Pylypchynets¹

2022

Scientific Herald of Uzhhorod University Series Physics

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Relevance. The photofission of shielded nuclear materials is widely used to develop methods for non-destructive analysis of their isotopic composition. To stimulate the photofission reaction, bremsstrahlung beams obtained on electronic accelerators are used. Their parameters significantly depend on the design features of accelerators and sample activation schemes. Purpose. Theoretical modelling of parameters of an optimal scheme for stimulating the photofission of shielded nuclear materials on an electronic accelerator – Microtron M-30 for the analysis of their isotopic composition, considering its technical characteristics, and experimental verification of its parameters. Methodology. Theoretical calculations of the parameters of bremsstrahlung beams for the Microtron M-30 were carried out using the GEANT4 toolkit. For experimental studies of the influence of structural elements of the optimal stimulation scheme on the integral characteristics of inhibitory photons, secondary photoneutrons, the method of activation of detectors made of gold was used; for residual electrons – the transmission method based on a passage chamber and a Faraday cylinder. Results. As a result of the combination of theoretical and experimental studies, optimal parameters of the activation scheme of nuclear materials on the Microtron M-30 have been established. The scheme provides experimental conditions under which the losses of bremsstrahlung photon beams interacting with the test samples (with energies ≥6 MeV) do not exceed 35% of their initial values, with the practical absence of residual electrons (98% of electrons are absorbed) and secondary photoneutrons (no more than 1E-9 n/e). Conclusions. The parameters of the developed stimulation scheme for the Microtron M-30 can be applied to various types of accelerators, considering their design features, characteristics of the samples, and implemented activation schemes

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Section: Comparison With the Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal scheme for stimulating photofission of shielded nuclear materials on the Microtron M-30: a combination of theoretical and experimental studies

Pylypchynets¹

2022

Scientific Herald of Uzhhorod University Series Physics

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Photon and Photoneutron Outputs Simulation From a Tantalum Converter at the M-30 Microtron

Oleinikov,

Pylypchynets,

Parlag

et al. 2024

Problems of Atomic Science and Technology

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Reliable information about the outputs of bremsstrahlung photons and secondary photoneutrons from converters on electron accelerators with mandatory consideration of their technical characteristics is necessary for optimizing the process of sample irradiation and predicting the results of experimental studies. The results of modeling the de- pendence of photon and photoneutron yields and their ratios on the thickness of the tantalum converter (thickness – 0.04; 0.4; 1.0; 4.0; 10.0 mm) are presented at fixed energies of the initial electron beam – 10.0, 12.5, 14.5, 17.5, and 20 MeV. Calculations were carried out for the electron accelerator of the National Academy of Sciences of Ukraine, the M-30 microtron, taking into account its technical characteristics (electron discharge node). The GEANT4 toolkit was used for computer simulation.

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Simulation study on radiation fields around targets to apply CR-39 for photo-neutron measurement in electron accelerator near the threshold energy

Cited by 2 publications

References 19 publications

Optimal scheme for stimulating photofission of shielded nuclear materials on the Microtron M-30: a combination of theoretical and experimental studies

Optimal scheme for stimulating photofission of shielded nuclear materials on the Microtron M-30: a combination of theoretical and experimental studies

Photon and Photoneutron Outputs Simulation From a Tantalum Converter at the M-30 Microtron

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