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

{"title":"Continuous ion beam-induced luminescence (IBIL) spectroscopy of air-borne particulate matter hourly collected from the atmosphere","authors":"Wataru Kada ,&nbsp;Koki Usui ,&nbsp;Sota Nakatsu ,&nbsp;Kimiyo Kumagai ,&nbsp;Hiroshi Tago ,&nbsp;Takahiro Satoh ,&nbsp;Yasuyuki Ishii ,&nbsp;Osamu Hanaizumi","doi":"10.1016/j.nimb.2024.165444","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165444","url":null,"abstract":"<div><p>We investigated the applicability of Ion Beam Induced Luminescence (IBIL) analysis for identifying biological components in sequentially collected airborne particulate matter (PM) samples obtained using the automated sampler. A series of micro-IBIL spectroscopies were performed on a PTFE (polytetrafluoroethylene) membrane tape filter from the Atmospheric Environmental Regional Observation System (AEROS) during a highly concentrated air pollution event on 26–27 March 2020, collected at Ota, Japan (36.290°n, 139.381°e) using an external 3 MeV proton microprobe. IBIL at typical wavelengths associated with organic compounds such as NADH and riboflavin were identified through the series of IBIL analyses, which is a key factor for identifying existence of organic pollutions, or bioaerosols. The decay times of the IBIL indicate that the peak measured is due to organic compounds rather than inorganic particles or ambient substances. These results suggest that micro-IBIL spectroscopy can be used to identify bioaerosols in hourly collected AEROS PTFE membrane tape filters taken from the atmosphere.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481371","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}

{"title":"Diamond energy-dispersive dosimeter for measuring linear energy deposition distributions in clinical carbon beam therapy","authors":"Takumi Matsumoto ,&nbsp;Katsumi Aoki ,&nbsp;Hideyuki Takei ,&nbsp;Takahiro Makino ,&nbsp;Shunsuke Yonai ,&nbsp;Christina Weiss ,&nbsp;Erich Griesmayer ,&nbsp;Takeshi Ohshima ,&nbsp;Makoto Sakai ,&nbsp;Akihiko Matsumura ,&nbsp;Wataru Kada","doi":"10.1016/j.nimb.2024.165430","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165430","url":null,"abstract":"<div><p>A thin diamond membrane energy-dispersive dosimeter 50 μm thick was fabricated for estimating clinical dose distribution. In contrast to conventional semiconductors, diamond wide-bandgap semiconductors are expected to have excellent radiation tolerance and biological compatibility based on the linear relationship of stopping power ratio for clinical carbon particles. Linear energy transfer (LET) spectra were obtained along with the Bragg curve for a clinical carbon beam generated at Gunma University Heavy Ion Medical Center. The relative biological effectiveness (RBE) distributions were estimated from the LET spectra for both the mono-energy and spread-out Bragg peak irradiation configurations. The diamond detector was also used as a solid ionization chamber to obtain the radiation-induced current (RIC) distribution, which represents the physical dose distribution. The clinical dose distribution was estimated from the RIC and RBE distributions as proof of concept for the clinical carbon beam therapy field with a single-chip diamond energy-dispersive dosimeter.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0168583X24002003/pdfft?md5=7538ded1cb93f00ff059108bc426abb7&pid=1-s2.0-S0168583X24002003-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481370","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}

{"title":"Cathode shape dependence of gas ionization chamber on electron collection in ΔE − E telescope ERDA","authors":"I. Harayama ,&nbsp;Y. Hirose ,&nbsp;D. Sekiba","doi":"10.1016/j.nimb.2024.165435","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165435","url":null,"abstract":"<div><p>Our Δ<em>E</em> − <em>E</em> telescope elastic recoil detection analysis (ERDA) system employed a gas ionization chamber (GIC), which consisted of a U-shaped cathode, Frisch grid, and anode. The cathode shape was designed to downsize the electrodes. The difference of performance between the U-shaped and planar shaped cathodes, however, has not been studied well, yet. Therefore, we quantitatively evaluated the influence using the U-shaped cathode on Δ<em>E − E</em> telescope ERDA. The performances of U-shaped and planar shaped cathodes were compared from the viewpoint of a recoil counting loss due to the stagnation inducing a recombination of ion–electron pairs, and the electron uptake by the Frisch grid. No significant difference occurs between the two cathodes from the viewpoint of O recoil yields. The inhomogeneous electric field formed by the U-shaped cathode, however, induced the electron collection suppression, which leads to an attenuation of Δ<em>E</em> pulse heights. In our ERDA condition, the lateral straggling of recoils is suppressed due to their high energy, so that the attenuation of Δ<em>E</em> pulse heights is not severe and does not impair the reliability of Δ<em>E</em> − <em>E</em> telescope ERDA. These results show that the U-shaped cathode can also be used safely for Δ<em>E</em> − <em>E</em> telescope ERDA, and that GICs have a flexibility in the electrode shape, which is useful to make GICs more compact.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481369","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}

{"title":"On the question whether surface roughness can explain the absence of a prominent single-collision peak in keV heavy-ion scattering off a polycrystalline Ru surface","authors":"L. Assink ,&nbsp;J. Brötzner ,&nbsp;C. Cupak ,&nbsp;M. Salverda ,&nbsp;H.T. Jonkman ,&nbsp;O.O. Versolato ,&nbsp;R.A. Wilhelm ,&nbsp;R. Hoekstra","doi":"10.1016/j.nimb.2024.165442","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165442","url":null,"abstract":"<div><p>In a joint experimental and modeling effort, we have studied 15 keV Ar<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>, Kr<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>, and Xe<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span> projectiles scattering off a polycrystalline Ru surface to assess the possible role of surface roughness in the apparent near-absence of the single-collision (SC) peak for Xe, the heaviest of the ions. The surface roughness of the Ru sample was determined by atomic force microscopy (AFM). The AFM image is used as input to simulations by means of the ray tracing code SPRAY. The observed spectra display a significant SC peak in the energy distributions of reflected Ar and Kr ions, which is not the case for Xe. The energy spectrum produced by the reflection of Xe and recoiled Ru ions closely corresponds to the results obtained from our SPRAY simulations. It is evident that surface roughness plays a crucial role in the visibility of the SC peak. From simulations for different target roughnesses, it is clear that a concentrated distribution of inclination angles centered around 2° effectively reduces the intensity of the single-collision peak for Xe ion scattering. The presence of a distinct SC peak for Ar and Kr ions, unlike Xe ions, supports the notion that the absence of a prominent SC peak in Xe ion scattering is not primarily due to geometric blocking of trajectories by surface roughness. This suggests that for slow, heavy ions like Xe, scattering effects arising from the nearest neighbors to the binary collision partner are significant and should be carefully examined.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0168583X2400212X/pdfft?md5=6c8d406ea92f0bde500111ff16934312&pid=1-s2.0-S0168583X2400212X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141479562","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}

{"title":"Dynamic Analysis of major elements in biological tissue validating quantification of trace life elements in MeV ion beam microscopy","authors":"Harry J. Whitlow ,&nbsp;Andrej Kuznetsov ,&nbsp;Alexander Azarov ,&nbsp;Gyula Nagy ,&nbsp;Robert J.W. Frost ,&nbsp;Nicholas Henderson ,&nbsp;Richard Greco ,&nbsp;Naresh Deoli ,&nbsp;Karen M. Smith ,&nbsp;Wanwisa Sudprasert ,&nbsp;Sumittra Amphalop ,&nbsp;Wimonrut Insuan ,&nbsp;Sakulchit Wichianchot ,&nbsp;Min-Qin Ren ,&nbsp;Thomas Osipowicz ,&nbsp;Chris G. Ryan ,&nbsp;Francois Villinger","doi":"10.1016/j.nimb.2024.165411","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165411","url":null,"abstract":"<div><p>MeV ion microprobe measurements of the lesser and trace life element concentrations in biological tissues are challenging because of complex spatial inhomogeneities in these types of samples. Measurements on ex vivo tissue sections require determination of the matrix element composition and the tissue section thickness. For these reasons, in this work, we adapted the Dynamic Analysis approach known from literature, to interpret the MeV ion microscopy data to determine concentrations of H, C, O, and N as well as the thickness of different tissue regions in Non Human Primate (NHP) mesenteric lymph node section. The results showed no strong variations of the matrix element contents regardless of section thickness variations in the tissue. The matrix information was used to quantify total-Ca molarities and a significant <span><math><mo>∼</mo></math></span>30 mM Ca concentration hotspot was observed at the edge of sinus structure in the mesenteric lymph node as compared to the 3-4 mM total-Ca levels in the surrounding tissues. Thus, MeV ion microprobe imaging combined with dynamic analysis comprise a novel chemometric approach paving a way for quantitative analysis of similarly complicated animal and plant biological tissue sections.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0168583X24001812/pdfft?md5=461c5a78830c3d06a43594ae574169df&pid=1-s2.0-S0168583X24001812-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141439140","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}

{"title":"K X-ray production cross sections of transition metals induced by carbon ions impact: Influence of projectile mass","authors":"D.L. Serrano Juárez ,&nbsp;J. Miranda ,&nbsp;J.C. Pineda ,&nbsp;S. Reynoso-Cruces","doi":"10.1016/j.nimb.2024.165443","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165443","url":null,"abstract":"<div><p>K X-ray production cross sections of Co, Ni, and Zn due to the impact of 2.48 MeV to 3.84 MeV ¹²C³⁺ and ¹³C³⁺ ions were experimentally determined using the thick target approach. It was possible to observe differences in the cross sections due to the distinct mass of the ions. A reduced variable <em>v</em>₁/<em>v</em>_2K, where <em>v</em>₁ is the ion velocity and <em>v</em>_2K is the (Bohr) electron orbital velocity, was considered to scale the ion energies. When the data were plotted as a function of the reduced variable, a single curve was obtained for all targets and both isotopes. Comparisons with several models were also made, including corrections due to electron capture and multiple ionization. It was found that the adiabatic perturbation with molecular orbitals formation, plus electron capture and multiple ionization corrections, is the theory that better describes the experimental results.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0168583X24002131/pdfft?md5=5ce5101f2ab21adf53800c9a2ec1c82d&pid=1-s2.0-S0168583X24002131-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141434369","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}

{"title":"Effect of 60 MeV nitrogen ion irradiation on few layer WSe2 nanosystems","authors":"Bhupali Deka ,&nbsp;Dhanjit Talukdar ,&nbsp;D. Mohanta","doi":"10.1016/j.nimb.2024.165438","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165438","url":null,"abstract":"<div><p>This study explores the impact of 60 MeV N⁵⁺ ion irradiation on few layer WSe₂ systems. The structural analysis exhibit an anomalous variation in crystallite size with increasing grain growth after irradiation. Raman spectroscopy study reveals increased disorder, enhanced intensities of prominent modes, and an eight-fold rise in AFM-measured roughness from 27.2 nm to 212.6 nm. HR-TEM shows voids in nanosheets post-irradiation. In addition, DFT calculations on monolayer with vacancy clusters shows modification of WSe₂ bandgap from 1.48 eV to 0.37 eV. Interrelated structural, morphological and electronic structure calculations would provide useful insights upon controlled radiation exposure.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141434370","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}

{"title":"Emission of quasi-monochromatic ultrasoft X-ray of multilayer target in the Bragg direction under 5.7 MeV electron irradiation","authors":"S.R. Uglov,&nbsp;A.V. Vukolov,&nbsp;M.V. Shevelev","doi":"10.1016/j.nimb.2024.165431","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165431","url":null,"abstract":"<div><p>Previously, it was experimentally shown that VUV radiation generated in a periodic structure of a multilayer X-ray mirror by relativistic electrons exhibits a quasi-monochromatic spectrum depending on the angle of inclination of the target and the direction of emission of radiation inside the radiation cone. Here, we present new experimental results regarding the properties of angular density of radiation. A comparison between the measured radiation intensity over a wide range of target inclination angles and theoretical calculations is provided.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141429416","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}

{"title":"L- and M-subshell ionization cross-sections of heavy atoms by electron and proton impact","authors":"C.C. Montanari ,&nbsp;S. Segui ,&nbsp;A.M.P. Mendez ,&nbsp;D.M. Mitnik","doi":"10.1016/j.nimb.2024.165440","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165440","url":null,"abstract":"<div><p>Inner-shell ionization has many applications related to material analysis. However, full theoretical calculations in heavy multielectronic atoms are scarce. In this contribution, we assess proton and electron impact L<span><math><msub><mrow></mrow><mrow><mi>i</mi></mrow></msub></math></span> and M<span><math><msub><mrow></mrow><mrow><mi>i</mi></mrow></msub></math></span>-subshell ionization cross-sections of heavy targets (<span><math><mrow><mn>72</mn><mo>≤</mo><mi>Z</mi><mo>≤</mo><mn>83</mn></mrow></math></span>) using two theoretical models. These calculations are based on the Distorted Plane Wave Born Approximation for electron impact and the shellwise local plasma approximation for the proton impact, combined with relativistic calculations of these deep subshells wave functions and binding energies. We analyze the L-shell ionization of W, Au, and Bi and the M-shell of Hf, Ta, W, Re, Os, Pt, Au, Pb, and Bi. Present values are compared with available experimental data from the literature, with disparate agreement. The convergence of proton and electron impact cross-sections at high-impact velocities is also discussed.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141423837","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}

{"title":"Mega-electron volt proton detection using a thin diamond membrane detector","authors":"Guo Zikun ,&nbsp;Yang Chengyuan ,&nbsp;Mi Zhaohong ,&nbsp;Mu Zhenkun ,&nbsp;Choo Run Kang Neville ,&nbsp;Jin Huining ,&nbsp;Andrew A. Bettiol","doi":"10.1016/j.nimb.2024.165432","DOIUrl":"https://doi.org/10.1016/j.nimb.2024.165432","url":null,"abstract":"<div><p>The development of single crystal chemical vapour deposition (scCVD) diamond membrane radiation detector is introduced in this paper. The fabrication of the diamond membrane radiation detector is illustrated, including the improvement of the diamond membrane sample and the usage of a homemade printed circuit board (PCB) to reduce the influence of the external noise and to build a complete device in a small volume. From the experimental results, the behavior of the diamond radiation detector using a beam of 2 MeV protons indicates that a 6.1 μm Optical-grade diamond membrane is capable of detecting the transmitted protons with low energy loss. The experimental results are fitted using the modified Hecht equation to introduce the avalanche effect.</p></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141328364","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}