Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms最新文献

英文中文

Gamma irradiation effect on the structural and optical properties of manganese (III) phthalocyanine chloride films: Experimental and theoretical approach for optoelectronic applications 伽马辐照对氯化锰（III）酞菁薄膜的结构和光学特性的影响：光电应用的实验和理论方法

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-11-01 DOI: 10.1016/j.nimb.2024.165556

E.F.M. El-Zaidia , A.A.A. Darwish , Shaaban A. Elroby , A.M. Hassanien

Irradiation using ionizing radiation such as gamma-ray alters the material characteristics of organic semiconductors, especially the optical and electronic properties. The potential changes of manganese phthalocyanine chloride (MnPcCl) films have been investigated after several gamma irradiation doses (50, 150, and 250 kGy). The possible chemical structure and electronic characteristics of MnPcCl dye were analyzed using the density functional theory-based quantum calculations. The X-ray diffraction of various gamma-ray doses confirmed the amorphous nature of MnPcCl. Based on UV–Vis-NIR spectrophotometric measurements, Tauc’s method has been used to deduce the optical bandgap energy of MnPcCl films before and after γ-irradiation. A slight non-linear reduction was observed in the optical bandgap energy, refractive index, and dielectric constant with rising γ-irradiation doses. The reduction in these optical parameters was due to the increase in the defects and the disorder degree created by γ-irradiation. The low effect on the optical parameters of MnPcCl films confirms its optical stability within this high range of γ-irradiation doses. Such investigation highlights the scope for the stability of this organic dye after exposure to γ-irradiation doses for use in optoelectronic/photonic technological devices.

使用伽马射线等电离辐射进行辐照会改变有机半导体的材料特性，尤其是光学和电子特性。我们研究了氯化酞菁锰（MnPcCl）薄膜在经过不同剂量（50、150 和 250 kGy）的伽马射线辐照后可能发生的变化。利用基于密度泛函理论的量子计算分析了氯化锰酞菁染料可能的化学结构和电子特性。不同伽马射线剂量下的 X 射线衍射证实了 MnPcCl 的无定形性质。根据紫外-可见-近红外分光光度法的测量结果，采用陶氏方法推测了γ辐照前后氯化锰薄膜的光带隙能。随着γ-辐照剂量的增加，光带隙能、折射率和介电常数都出现了轻微的非线性下降。这些光学参数的降低是由于γ-辐照造成的缺陷和无序度的增加。对氯化锰薄膜光学参数的影响较小，这证实了其在γ-辐照剂量高范围内的光学稳定性。这项研究强调了这种有机染料在暴露于γ-辐照剂量后在光电/光子技术设备中的稳定性。

{"title":"Gamma irradiation effect on the structural and optical properties of manganese (III) phthalocyanine chloride films: Experimental and theoretical approach for optoelectronic applications","authors":"E.F.M. El-Zaidia , A.A.A. Darwish , Shaaban A. Elroby , A.M. Hassanien","doi":"10.1016/j.nimb.2024.165556","DOIUrl":"10.1016/j.nimb.2024.165556","url":null,"abstract":"<div><div>Irradiation using ionizing radiation such as gamma-ray alters the material characteristics of organic semiconductors, especially the optical and electronic properties. The potential changes of manganese phthalocyanine chloride (MnPcCl) films have been investigated after several gamma irradiation doses (50, 150, and 250 kGy). The possible chemical structure and electronic characteristics of MnPcCl dye were analyzed using the density functional theory-based quantum calculations. The X-ray diffraction of various gamma-ray doses confirmed the amorphous nature of MnPcCl. Based on UV–Vis-NIR spectrophotometric measurements, Tauc’s method has been used to deduce the optical bandgap energy of MnPcCl films before and after γ-irradiation. A slight non-linear reduction was observed in the optical bandgap energy, refractive index, and dielectric constant with rising γ-irradiation doses. The reduction in these optical parameters was due to the increase in the defects and the disorder degree created by γ-irradiation. The low effect on the optical parameters of MnPcCl films confirms its optical stability within this high range of γ-irradiation doses. Such investigation highlights the scope for the stability of this organic dye after exposure to γ-irradiation doses for use in optoelectronic/photonic technological devices.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"557 ","pages":"Article 165556"},"PeriodicalIF":1.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reevaluation of neutron energy spectrum in Heavy-Water neutron irradiation facility of Kyoto University research Reactor using multifoil activation method 利用多线圈活化法重新评估京都大学研究用反应堆重水中子辐照设施的中子能谱

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-11-01 DOI: 10.1016/j.nimb.2024.165555

Jakkrit Prateepkaew , Yoshinori Sakurai

The Heavy-Water Thermal Neutron Facility at Kyoto University Research Reactor (KUR) has been operational for boron neutron capture therapy (BNCT) since May 1974. Following a facility construction update in 1996, the facility name was changed to the Heavy-Water Neutron Irradiation Facility (HWNIF), and the neutron energy spectra were evaluated using the multifoil activation method. In May 2010, the KUR transitioned its operations from high-enrichment fuel to low-enrichment fuel. However, the neutron energy spectrum in the KUR-HWNIF has not been reevaluated with high accuracy since then. This paper reports the reevaluation of the neutron energy spectrum for the standard epithermal-neutron irradiation mode using the multifoil activation method. Based on the reevaluated results, the epithermal- and fast-neutron fluxes increased by approximately 34 % and 19 %, respectively. The neutron absorption dose rate at evaluation point was approximately 17 % lower than the previous one; however, it remained acceptable from the perspective of BNCT biological irradiation.

京都大学研究堆（KUR）的重水热中子设施自 1974 年 5 月开始运行，用于硼中子俘获治疗（BNCT）。1996 年设施建设更新后，该设施更名为重水中子辐照设施（HWNIF），并使用多线圈活化法对中子能谱进行了评估。2010 年 5 月，KUR 从高浓缩燃料过渡到低浓缩燃料。然而，自那时起，KUR-HWNIF 的中子能谱一直没有得到高精度的重新评估。本文报告了利用多线圈活化法对标准外延-中子辐照模式的中子能谱进行的重新评估。根据重新评估的结果，表热和快速中子通量分别增加了约 34% 和 19%。评估点的中子吸收剂量率比以前低了约 17%，但从 BNCT 生物辐照的角度来看，仍是可以接受的。

{"title":"Reevaluation of neutron energy spectrum in Heavy-Water neutron irradiation facility of Kyoto University research Reactor using multifoil activation method","authors":"Jakkrit Prateepkaew , Yoshinori Sakurai","doi":"10.1016/j.nimb.2024.165555","DOIUrl":"10.1016/j.nimb.2024.165555","url":null,"abstract":"<div><div>The Heavy-Water Thermal Neutron Facility at Kyoto University Research Reactor (KUR) has been operational for boron neutron capture therapy (BNCT) since May 1974. Following a facility construction update in 1996, the facility name was changed to the Heavy-Water Neutron Irradiation Facility (HWNIF), and the neutron energy spectra were evaluated using the multifoil activation method. In May 2010, the KUR transitioned its operations from high-enrichment fuel to low-enrichment fuel. However, the neutron energy spectrum in the KUR-HWNIF has not been reevaluated with high accuracy since then. This paper reports the reevaluation of the neutron energy spectrum for the standard epithermal-neutron irradiation mode using the multifoil activation method. Based on the reevaluated results, the epithermal- and fast-neutron fluxes increased by approximately 34 % and 19 %, respectively. The neutron absorption dose rate at evaluation point was approximately 17 % lower than the previous one; however, it remained acceptable from the perspective of BNCT biological irradiation.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"557 ","pages":"Article 165555"},"PeriodicalIF":1.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Comprehensive study of the exposure and energy absorption buildup factors in some polymer composites for point isotropic Source, including the effect of bremsstrahlung 点各向同性源某些聚合物复合材料的暴露和能量吸收累积因子综合研究，包括轫致辐射的影响

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-11-01 DOI: 10.1016/j.nimb.2024.165552

Keyhandokht Karimi-Shahri , Yasaman Rezaei Moghaddam , Parisa Akhlaghi , Najmeh Mohammadi , Atiyeh Ebrahimi-Khankook

The exposure (EBF) and energy absorption buildup factors (EABF) of different polymer composites (SiW, PHEMA-WO₃, CaWO₄, EWO₃, BaTiO₃, PbCl₂) has been investigated for photon isotropic source with the energy range of 0.015–15 MeV and the penetration depth of 1–10 mean free path(mfp). Furthermore, the contribution of bremsstrahlung effect on selected polymer composites EBF has been discussed. Simulations were performed by MCNPX Monte Carlo code. Model validation was carried out by comparing theoretical uncollided flux and EBF of water with similar published data. The results indicate that EBF and EABF values are dependent on the incident photon energy and the depth of penetration. The maximum and minimum values of EBF and EABF are related to BaTiO₃ and SiW, respectively. Moreover, it is observed that considering bremsstrahlung increases values, especially at energies greater than 3 MeV.

研究了不同聚合物复合材料（SiW、PHEMA-WO3、CaWO4、EWO3、BaTiO3、PbCl2）在能量范围为 0.015-15 MeV、穿透深度为 1-10 平均自由路径（mfp）的光子各向同性源下的暴露（EBF）和能量吸收积累因子（EABF）。此外，还讨论了轫致辐射效应对选定聚合物复合材料 EBF 的贡献。模拟采用 MCNPX 蒙特卡罗代码进行。通过将水的理论非碰撞通量和 EBF 与已发表的类似数据进行比较，对模型进行了验证。结果表明，EBF 和 EABF 值取决于入射光子能量和穿透深度。EBF 和 EABF 的最大值和最小值分别与 BaTiO3 和 SiW 有关。此外，还观察到轫致辐射会增加数值，尤其是在能量大于 3 MeV 时。

{"title":"A Comprehensive study of the exposure and energy absorption buildup factors in some polymer composites for point isotropic Source, including the effect of bremsstrahlung","authors":"Keyhandokht Karimi-Shahri , Yasaman Rezaei Moghaddam , Parisa Akhlaghi , Najmeh Mohammadi , Atiyeh Ebrahimi-Khankook","doi":"10.1016/j.nimb.2024.165552","DOIUrl":"10.1016/j.nimb.2024.165552","url":null,"abstract":"<div><div>The exposure (EBF) and energy absorption buildup factors (EABF) of different polymer composites (SiW, PHEMA-WO<sub>3</sub>, CaWO<sub>4</sub>, EWO<sub>3</sub>, BaTiO<sub>3</sub>, PbCl<sub>2</sub>) has been investigated for photon isotropic source with the energy range of 0.015–15 MeV and the penetration depth of 1–10 mean free path(mfp). Furthermore, the contribution of bremsstrahlung effect on selected polymer composites EBF has been discussed. Simulations were performed by MCNPX Monte Carlo code. Model validation was carried out by comparing theoretical uncollided flux and EBF of water with similar published data. The results indicate that EBF and EABF values are dependent on the incident photon energy and the depth of penetration. The maximum and minimum values of EBF and EABF are related to BaTiO<sub>3</sub> and SiW, respectively. Moreover, it is observed that considering bremsstrahlung increases values, especially at energies greater than 3 MeV.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"557 ","pages":"Article 165552"},"PeriodicalIF":1.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of flux-weighted average cross-section in the photo-neutron reactions of Nb at the bremsstrahlung end-point energies of 20 MeV and 67 MeV 在轫致辐射端点能量为 20 MeV 和 67 MeV 时测量铌的光中子反应中的通量加权平均截面

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-10-30 DOI: 10.1016/j.nimb.2024.165557

R.V. Avetisyan, A.G. Barseghyan, Yu A. Gharibyan, A.V. Gyurjinyan, H.A. Mkrtchyan, A. Yu Petrosyan, I.A. Kerobyan

The photo-neutron flux-weighted average cross-sections for ⁹³Nb(γ,xn) reactions at the bremsstrahlung end-point energies of 20 MeV and 67 MeV have been measured by the activation technique using the electron linear accelerator LUE-75 located at the A.I. Alikhanyan National Science Laboratory (AANL). Furthermore, the isomeric cross-section ratio has been determined for the ^89m,gNb isomeric pair. TALYS 1.96 and EMPIRE 3.2 nuclear codes were used to calculate the ⁹³Nb(γ,xn) reaction cross-sections and isomeric ratio as functions of bremsstrahlung end-point energy. The energy distribution of bremsstrahlung photons has been calculated by GEANT4. The measured experimental data has been compared with currently available literature data as well as with the values based on theoretical calculations.

利用位于阿利哈扬国家科学实验室（A.I. Alikhanyan National Science Laboratory，AANL）的电子直线加速器 LUE-75，通过活化技术测量了轫致辐射端点能量为 20 MeV 和 67 MeV 的 93Nb(γ,xn)反应的光-中子通量加权平均截面。此外，还测定了 89m,gNb 异构体对的异构体截面比。使用 TALYS 1.96 和 EMPIRE 3.2 核代码计算了 93Nb(γ,xn)反应截面和异构体比，作为轫致辐射端点能量的函数。轫致辐射光子的能量分布由 GEANT4 计算得出。已将测得的实验数据与现有文献数据以及理论计算值进行了比较。

引用次数: 0

Phase and composition analysis of erbium deuteride thin films prepared by magnetron reactive sputtering for proton source target 质子源靶用磁控反应溅射法制备的氘化铒薄膜的相位和成分分析

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-10-30 DOI: 10.1016/j.nimb.2024.165558

Y. Chen, J.J. Zhu, C.Y. Zhan

This study explores the synthesis and characterization of erbium deuteride (ErD_x) thin films using magnetron reactive sputtering (MRS) under varying deuterium gas flow rates. The findings reveal that the stoichiometric ratio of deuterium to erbium (D/Er) can be effectively controlled by adjusting the D₂ flow rate, transitioning compositions from ErD₂ to ErD₃. All films exhibited a cubic structure, with deuterium atoms occupying both tetrahedral and octahedral sites. Compared to the traditional two-step method, MRS-prepared films showed lower oxidation levels and higher preparation efficiency. Proton-source quality evaluation (PQE) confirmed the suitability of these films as high-quality targets. Additionally, this study introduces a rapid IBA method applicable during PQE, offering a non-destructive and cost-effective means to determine the composition within films.

本研究探讨了在不同氘气流率条件下利用磁控反应溅射（MRS）技术合成氘化铒（ErDx）薄膜并对其进行表征。研究结果表明，氘与铒的化学计量比（D/Er）可通过调节 D2 的流速得到有效控制，从而实现从 ErD2 到 ErD3 的成分过渡。所有薄膜都呈现立方结构，氘原子占据了四面体和八面体位点。与传统的两步法相比，MRS 制备的薄膜氧化程度更低，制备效率更高。质子源质量评估（PQE）证实了这些薄膜适合作为高质量靶材。此外，本研究还介绍了一种适用于 PQE 的快速 IBA 方法，为确定薄膜内的成分提供了一种无损且经济有效的方法。

引用次数: 0

Study of 3089 keV gamma-ray emission from the reaction of 12C(d, pγ1-0)13C for analytical applications 研究 12C(d,pγ1-0)13C 反应产生的 3089 keV 伽马射线辐射的分析应用

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-10-29 DOI: 10.1016/j.nimb.2024.165549

Alireza Jokar , Hafez Taghipour Aslani

In this work, the differential cross-sections of the ¹²C(d, pγ_1-0)¹³C reaction channel at an angle of 90° have been measured in the 585–1993 keV range using thin targets. The validity the present differential cross sections is checked by a benchmarking experiment. The obtained results are compared with the existing ones from literature. The total uncertainty of cross-sections is estimated to be 9 %.

在这项工作中，利用薄靶在 585-1993 keV 范围内测量了 12C(d，pγ1-0)13C 反应通道在 90° 角上的微分截面。通过基准实验检验了本微分截面的有效性。获得的结果与现有文献中的结果进行了比较。横截面的总不确定性估计为 9%。

引用次数: 0

Experimental assessment and analysis of calculations accuracy for the neutron-induced radio-isotopes in copper parts of radiotherapy accelerators 放疗加速器铜部件中的中子诱导放射性同位素计算精度的实验评估与分析

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-10-29 DOI: 10.1016/j.nimb.2024.165553

V. Blideanu , R. Behal , C. Besnard-Vauterin , V. Glagolev , X. Ledoux , J. Mrazek , B. Rapp , E. Simeckova

Induced radioactivity in particle accelerators is currently not sufficiently addressed, particularly for radiotherapy electron LINACs when the activation occurs via secondary neutrons created in photo-nuclear reactions.

Methodologies based on Monte-Carlo simulations coupled with activation calculation codes are often used to address this issue. Their accuracy, which is potentially affected by the limited capabilities of the calculation tools to simulate nuclear reactions at the origin of the materials activation, can be deeply analyzed only through comparisons with experimental values but the latter are not widely available.

New macroscopic data for the activity induced by neutrons in the materials commonly present in medical electron LINACs are presented. Neutron-induced activation has been measured by sample irradiation at SPIRAL2/NFS facility in accurately characterized configurations. Experimental results were compared to the simulations predictions allowing to assess the precision that can be achieved by a fully simulation-based methodology, mainly related to the energy-dependent reaction cross-sections.

目前，粒子加速器中的诱导放射性问题还没有得到充分解决，特别是在放疗电子 LINAC 中，活化是通过光核反应中产生的次级中子进行的。由于计算工具模拟材料活化源头核反应的能力有限，其准确性可能会受到影响，因此只能通过与实验值进行比较来深入分析，但后者并不普遍。在 SPIRAL2/NFS 设备上，通过精确表征的配置对样品进行辐照，测量了中子诱导活化。实验结果与模拟预测进行了比较，从而评估了完全基于模拟的方法所能达到的精度，主要涉及与能量相关的反应截面。

{"title":"Experimental assessment and analysis of calculations accuracy for the neutron-induced radio-isotopes in copper parts of radiotherapy accelerators","authors":"V. Blideanu , R. Behal , C. Besnard-Vauterin , V. Glagolev , X. Ledoux , J. Mrazek , B. Rapp , E. Simeckova","doi":"10.1016/j.nimb.2024.165553","DOIUrl":"10.1016/j.nimb.2024.165553","url":null,"abstract":"<div><div>Induced radioactivity in particle accelerators is currently not sufficiently addressed, particularly for radiotherapy electron LINACs when the activation occurs via secondary neutrons created in photo-nuclear reactions.</div><div>Methodologies based on Monte-Carlo simulations coupled with activation calculation codes are often used to address this issue. Their accuracy, which is potentially affected by the limited capabilities of the calculation tools to simulate nuclear reactions at the origin of the materials activation, can be deeply analyzed only through comparisons with experimental values but the latter are not widely available.</div><div>New macroscopic data for the activity induced by neutrons in the materials commonly present in medical electron LINACs are presented. Neutron-induced activation has been measured by sample irradiation at SPIRAL2/NFS facility in accurately characterized configurations. Experimental results were compared to the simulations predictions allowing to assess the precision that can be achieved by a fully simulation-based methodology, mainly related to the energy-dependent reaction cross-sections.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"557 ","pages":"Article 165553"},"PeriodicalIF":1.4,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Elastic recoil and scattering yields measured in low energy heavy ion ERD 在低能重离子ERD中测量的弹性反冲和散射当量

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-10-29 DOI: 10.1016/j.nimb.2024.165542

Mikko Kivekäs , Kenichiro Mizohata , Jaakko Julin , Markku Kainlauri , Mika Prunnila , Laura Keränen , Matti Putkonen , Tatu Korkiamäki , Mikko Laitinen

Experimental yields of low energy recoils and scattered beams in ToF-ERD have been measured and compared against theory. A significant discrepancy between Rutherford or Andersen cross-section predicted yield vs the experimental results is now demonstrated. Scale of the discrepancy is up to 50% compared to yields predicted by theory for low energy Au recoils. MCERD simulations were used to study the carbon foil scattering in the timing detectors to explain the observed discrepancy. Simulations indicate that a major part of the discrepancy occurs due to the scattering of low energy, heavy mass particles in the timing detector foils. The yield discrepancy can be narrowed down by taking into account the reduction of recoil yields caused by the carbon foil scattering. Further studies are in progress to study carbon foil scattering, aiming to further improve the quantitativity of ToF-ERD for the heavy elements.

我们测量了 ToF-ERD 中低能量反冲和散射光束的实验产率，并将其与理论进行了比较。现在已经证明，卢瑟福或安徒生横截面预测产率与实验结果之间存在重大差异。与理论预测的低能量金反冲产率相比，差距高达 50%。MCERD 模拟用于研究定时探测器中的碳箔散射，以解释观察到的差异。模拟结果表明，差异的主要部分是由于低能量、重质量粒子在定时探测器碳箔中的散射造成的。考虑到碳箔散射造成的反冲当量减少，可以缩小当量差异。目前正在进一步研究碳箔散射，目的是进一步提高 ToF-ERD 对重元素的定量性。

{"title":"Elastic recoil and scattering yields measured in low energy heavy ion ERD","authors":"Mikko Kivekäs , Kenichiro Mizohata , Jaakko Julin , Markku Kainlauri , Mika Prunnila , Laura Keränen , Matti Putkonen , Tatu Korkiamäki , Mikko Laitinen","doi":"10.1016/j.nimb.2024.165542","DOIUrl":"10.1016/j.nimb.2024.165542","url":null,"abstract":"<div><div>Experimental yields of low energy recoils and scattered beams in ToF-ERD have been measured and compared against theory. A significant discrepancy between Rutherford or Andersen cross-section predicted yield vs the experimental results is now demonstrated. Scale of the discrepancy is up to 50% compared to yields predicted by theory for low energy Au recoils. MCERD simulations were used to study the carbon foil scattering in the timing detectors to explain the observed discrepancy. Simulations indicate that a major part of the discrepancy occurs due to the scattering of low energy, heavy mass particles in the timing detector foils. The yield discrepancy can be narrowed down by taking into account the reduction of recoil yields caused by the carbon foil scattering. Further studies are in progress to study carbon foil scattering, aiming to further improve the quantitativity of ToF-ERD for the heavy elements.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"557 ","pages":"Article 165542"},"PeriodicalIF":1.4,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Validation of crystal surface scattering method for downsizing accelerator mass spectrometry 验证用于缩小加速器质谱的晶体表面散射法

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-10-25 DOI: 10.1016/j.nimb.2024.165545

Satoshi Jinno , Akihiro Matsubara , Natsuko Fujita , Kenji Kimura

This study introduces the development of a downsized Accelerator Mass Spectrometry (AMS) system aiming to enhance accessibility and cost-effectiveness in radiocarbon analysis. The “crystal surface stripper method” is introduced as a solution to challenges in AMS downsizing, demonstrating effective ion detection with a smaller angular spread compared to conventional gas stripper methods. The experimental results provide insights into charge conversion capabilities, scattering angle broadening, and energy loss associated with surface scattering.

本研究介绍了小型加速器质谱仪（AMS）系统的开发情况，旨在提高放射性碳分析的可及性和成本效益。与传统的气体剥离法相比，"晶体表面剥离法 "能以更小的角度展宽进行有效的离子检测。实验结果提供了与表面散射相关的电荷转换能力、散射角展宽和能量损失方面的见解。

引用次数: 0

ESR spectroscopic analysis of fructose as a dosimeter for gamma radiation 作为伽马辐射剂量计的果糖 ESR 光谱分析

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

Pub Date : 2024-10-24 DOI: 10.1016/j.nimb.2024.165551

Arif Rachmanto , Marrisa Arlinkha Ega Putri , Muhamad Yasin Yunus , Ade Lestari Yunus , Rizka Fitriana , Rahmawati Rahmawati

In this research, fructose was used as a dosimeter, and ESR examined the influence of radiation dose on the dosimeter’s properties. Microwave power, g-value, and decay of response tests were carried out at doses of 1, 5, and 10 kGy. The results show that fructose possesses linearity at doses of 5 × 10⁻²–30 kGy. The radiation detection sensitivity of fructose is better than sucrose’s but less than alanine’s over the entire dose range. The irradiation dose influences microwave saturation on ESR intensity, occurring at 5 and 10 kGy. The microwave power for irradiated fructose ranges from 1.00 to 2.46 mW. The ESR signal intensity increases with higher radiation doses, primarily due to the formation of more free radicals. Additionally, higher radiation doses lead to faster decay of the fructose dosimeter’s response. The fructose ESR intensity stability compared to alanine and sucrose at 1, 5, and 10 kGy are alanine > sucrose > fructose, alanine > fructose > sucrose, and alanine > fructose ≈ sucrose, respectively.

在这项研究中，果糖被用作剂量计，ESR 检验了辐射剂量对剂量计特性的影响。在剂量为 1、5 和 10 kGy 时进行了微波功率、g 值和响应衰减测试。结果表明，果糖在剂量为 5 × 10-2-30 kGy 时具有线性。在整个剂量范围内，果糖的辐射检测灵敏度优于蔗糖，但低于丙氨酸。辐照剂量影响微波对 ESR 强度的饱和度，在 5 和 10 kGy 时出现。辐照果糖的微波功率在 1.00 至 2.46 mW 之间。ESR 信号强度随着辐射剂量的增加而增加，这主要是由于形成了更多的自由基。此外，辐射剂量越高，果糖剂量计的响应衰减越快。与丙氨酸和蔗糖相比，在 1、5 和 10 kGy 下，果糖 ESR 强度的稳定性分别为丙氨酸 > 蔗糖 > 果糖、丙氨酸 > 果糖 > 蔗糖和丙氨酸 > 果糖 ≈ 蔗糖。

{"title":"ESR spectroscopic analysis of fructose as a dosimeter for gamma radiation","authors":"Arif Rachmanto , Marrisa Arlinkha Ega Putri , Muhamad Yasin Yunus , Ade Lestari Yunus , Rizka Fitriana , Rahmawati Rahmawati","doi":"10.1016/j.nimb.2024.165551","DOIUrl":"10.1016/j.nimb.2024.165551","url":null,"abstract":"<div><div>In this research, fructose was used as a dosimeter, and ESR examined the influence of radiation dose on the dosimeter’s properties. Microwave power, g-value, and decay of response tests were carried out at doses of 1, 5, and 10 kGy. The results show that fructose possesses linearity at doses of 5 × 10<sup>−2</sup>–30 kGy. The radiation detection sensitivity of fructose is better than sucrose’s but less than alanine’s over the entire dose range. The irradiation dose influences microwave saturation on ESR intensity, occurring at 5 and 10 kGy. The microwave power for irradiated fructose ranges from 1.00 to 2.46 mW. The ESR signal intensity increases with higher radiation doses, primarily due to the formation of more free radicals. Additionally, higher radiation doses lead to faster decay of the fructose dosimeter’s response. The fructose ESR intensity stability compared to alanine and sucrose at 1, 5, and 10 kGy are alanine > sucrose > fructose, alanine > fructose > sucrose, and alanine > fructose ≈ sucrose, respectively.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"557 ","pages":"Article 165551"},"PeriodicalIF":1.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀