Characterization of an extrapolation chamber in beta radiation beams and Monte Carlo modelling

Polo, Ivón Oramas; Santos, William S.; Caldas, Linda V.E.

doi:10.1016/j.radphyschem.2020.108746

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…The authors found differences to the calibration values of 4.8 %, 1.5 %, 4.2 %, 4.5 %, 7.7 % and 4.4 % for beta sources of 85 Kr (30 cm with filter) and 90 Sr/ 90 Y (11, 20, 30 and 50 cm without filter and 30 cm with filter), respectively. While Polo et al 2020 [16] presented results for 85 Kr, 90 Sr/ 90 Y (11 cm) and 147 Pm and likewise determined the absorbed dose rates to tissue at null depth. Differences with the calibration values found were 1 %, 0.2 % and 0.8 %, respectively.…”

Section: Absorbed Dose Rate To Tissue 𝑫 𝒕mentioning

confidence: 99%

“…Several computational MC codes are widely well known and used for radiation dosimetry such as, PENELOPE, GEANT4, FLUKA, EGSnrc, MCNP and others [8][9][10][11][12]. It is possible to find in literature publications reporting results on MC modelling and simulations using the varies MC codes available, of beta dosimetry systems with different types of extrapolation chambers [13][14][15][16][17][18][19][20][21][22]. However, there is no publication,…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo study of the BSS2 calibration system using the PTW 23392 extrapolation chamber

Araújo¹,

Behrens²,

Fonseca³

2022

J. Inst.

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The objective of the present work was to develop and validate a computational model of the Beta Secondary Standard type 2 (BSS2) system, with sources, filters and the PTW 23392 extrapolation chamber using MCNPx code. Simulations were performed to calculate the absorbed dose rate to tissue at null depth and 0.07 mm for the 85Kr, 90Sr/90Y and 147Pm beta radiation sources. The response curve was calculated by computing the energy deposited, at different depths, to the sensitive volume of the chamber. The deviations in the absorbed dose rate obtained using the MCNPx code compared to the calibration certificate data were found to be up to 2 %. Deviations up to 10 % were observed for the transmission factor calculated for all three beta sources. This work describes in detail the main parameters and common issues seeing when modelling an extrapolation chamber and three different beta standard sources.

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Section: Absorbed Dose Rate To Tissue 𝑫 𝒕mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monte Carlo study of the BSS2 calibration system using the PTW 23392 extrapolation chamber

Araújo¹,

Behrens²,

Fonseca³

2022

J. Inst.

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“…Vários códigos computacionais existem para a simulação do transporte de partículas e são utilizados como apoio às medidas experimentais (9,10). Diversos trabalhos publicados diariamente utilizam códigos de MC para diferentes cálculos nas áreas da dosimetria beta bem como em outras várias outras áreas de pesquisa (11)(12)(13).…”

Section: Introductionunclassified

Modelagem e Validação Computacional da Câmara de Extrapolação PTW 23392

2022

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Metodologias para medição da dose e taxa de dose absorvida por radiações beta são necessárias. Diversos radionuclídeos existentes são emissores beta e de radiação eletromagnética e, em muitos casos, a dose absorvida devido a radiação beta supera a dose correspondente aos raios gamas. Ferramentas computacionais tem permitido avanços significativos na otimização dos sistemas de medidas, no qual permite simular e avaliar a influência de diferentes parâmetros isoladamente. O método matemático Método de Monte Carlo (MMC) é utilizado para simular teoricamente processos estatísticos. Este método utiliza uma sequência de números aleatórios para simular um fenômeno físico. O código computacional Monte Carlo MCNPX leva em consideração bibliotecas de interação da radiação com a matéria e é reconhecido internacionalmente como um código eficiente para análise de transporte de diversos tipos de radiações. Este foi utilizado para a modelagem e simulação da câmara de extrapolação PTW-23392. A validação foi realizada através da comparação dos resultados das simulações com os publicados em literatura. A câmara de extrapolação foi posicionada 30 cm em relação a fonte de radiação. A fonte utilizada nas simulações foi o 85^Kr, que é um emissor de partículas beta com energia máxima de 0,687 MeV e meia vida de 10,7 anos.

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Electrospun hexagonal boron nitride/CNT reinforced nanocomposite fiber mats for cosmic radiation shielding

Ersoy,

Özcan,

Kaya

et al. 2024

Vinyl Additive Technology

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A novel methodology is introduced to asses the efficacy of cosmic radiation shielding through the fabrication of electrospun nanocomposite fiber mats reinforced with hexagonal boron nitride (h‐BN) and carbon nanotubes (CNTs). These mats were fabricated using various h‐BN particles synthesized with 1 M boric acid and four distinct 1 M nitrogen sources to produce polyethylene oxide (PEO) nanofibers via the electrospinning method at 15 kV, a 43.0 μL/min pumping rate, and a 20 cm distance with a maximum thickness of 10 μm. High neutron shielding capability nanocomposite fibers denoted BN‐F4 (spun with h‐BN [melamine]/CNT powders in a 5 wt% PEO solution) and BN‐F5 (spun with h‐BN [urea]/CNT powders in a 5 wt% PEO solution) were produced. By calculating the theoretical photon transmittance and evaluating the neutron shielding efficiency with an Am‐Be neutron source and a BF3 neutron detector, the cosmic radiation shielding capability of nanocomposite mats was discussed. BN‐F4 and BN‐F5 exhibited neutron shielding properties of 7.124% and 6.37% for 3.82 and 1.87 g/mL, respectively. This research establishes a new benchmark in the fabrication of flexible, ultrathin, and lightweight radiation shielding materials and enhances the practicality of nanocomposites reinforced with h‐BN and CNTs by incorporating synthesizing and characterizing steps.Highlights In the study, hexagonal boron nitride production was carried out with four different nitrogen sources and which one showed better structural and morphological properties was supported by analysis. Additionally, an optimization study of nanofibers by electrospinning by adding CNT and h‐BN particles with PEO polymer is included. It is thought that the production of h‐BN and nanofiber work as a radiation shielding feature for use in space studies will be innovative and contribute to the deficiency in the literature.

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Characterization of an extrapolation chamber in beta radiation beams and Monte Carlo modelling

Cited by 4 publications

References 15 publications

Monte Carlo study of the BSS2 calibration system using the PTW 23392 extrapolation chamber

Monte Carlo study of the BSS2 calibration system using the PTW 23392 extrapolation chamber

Modelagem e Validação Computacional da Câmara de Extrapolação PTW 23392

Electrospun hexagonal boron nitride/CNT reinforced nanocomposite fiber mats for cosmic radiation shielding

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