Radiation Physics and Chemistry最新文献

{"title":"Degeneration mechanism of 30 MeV and 100 MeV proton irradiation effects on 1.2 kV SiC MOSFETs","authors":"Jae Hwa Seo ,&nbsp;Young Jo Kim ,&nbsp;In Ho Kang ,&nbsp;Jeong Hyun Moon ,&nbsp;Yu-Mi Kim ,&nbsp;Young Jun Yoon ,&nbsp;Hyoung Woo Kim","doi":"10.1016/j.radphyschem.2024.112378","DOIUrl":"10.1016/j.radphyschem.2024.112378","url":null,"abstract":"<div><div>In this study, we evaluated and characterized the effects of various proton irradiation energies and fluences on the electrical characteristics of SiC MOSFETs using a proton accelerator. The devices under test (DUTs) were fabricated utilizing 1.2 kV SiC MOSFET processes. To assess the impact of total ionizing dose (TID) and displacement damage (DD) on SiC MOSFETs, the DUTs were exposed to protons irradiation at energies of 30 MeV and 100 MeV, under ambient temperature conditions. Additionally, we examined the radiation hardness of DUTs under varying proton fluences, including 1 × 10¹² cm⁻², 1 × 10¹³ cm⁻², 5 × 10¹³ cm⁻², and 1 × 10¹⁴ cm⁻².</div><div>The results demonstrate that the threshold voltage (<em>V</em>_th) of the irradiated devices exhibited a negative shift, attributable to radiation-induced positive oxide trapped charges. This negative shift in <em>V</em>_th, coupled with the accumulation of positive trapped charges in the field limiting ring (FLR) oxide, resulted in augmented output currents and diminished breakdown voltage (BV) values. A significant reduction in current, ranging from 70% to 99%, was observed in the DUT subjected to irradiation at of 30 MeV and 1 × 10¹⁴ cm⁻², highlighting the influence of DD. Conversely, irradiation at 100 MeV primarily revealed TID effects, characterized by a negatively shifted <em>V</em>_th. The on-state current at a gate voltage of 10 V and a drain voltage of 5 V of the DUT with irradiation of 100 MeV and 1 × 10¹⁴ cm⁻² was a higher than that of DUT without irradiation because of a reduction of <em>V</em>_th.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112378"},"PeriodicalIF":2.8,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664093","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":"Creation of color centers in MgF2 single crystals by swift heavy ions: Energy loss and fluence dependence","authors":"Ayman S. El-Said","doi":"10.1016/j.radphyschem.2024.112369","DOIUrl":"10.1016/j.radphyschem.2024.112369","url":null,"abstract":"<div><div>Ion-solid interaction leads to significant modifications in the surface and bulk of different materials. MgF₂ of a rutile crystalline structure is an important optical material for a large variety of applications. The single crystals were irradiated with energetic heavy ions of various kinetic energies and fluences. After irradiation, we utilized optical spectroscopy to study the ion-induced defects and their evolutions as a function of ion beam parameters. The absorption spectra show the creation of different types of ion-induced defects, namely F-, F₂-, and F₃-centers. The concentrations of the observed color centers as well as their creation efficiency are studied in terms of ion energy loss and fluence. The results are of high importance for understanding the degradation of optical materials in space environments.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112369"},"PeriodicalIF":2.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664148","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":"Heavy-ion-irradiation effect of yttrium-stabilized-zirconia coatings on microstructure and lead-bismuth corrosion","authors":"Changda Zhu ,&nbsp;Guofeng Qu ,&nbsp;Lihong Zhai ,&nbsp;Mingyang Zhou ,&nbsp;Xi Qiu ,&nbsp;Yang Gao ,&nbsp;Ziyao Long ,&nbsp;Jijun Yang","doi":"10.1016/j.radphyschem.2024.112370","DOIUrl":"10.1016/j.radphyschem.2024.112370","url":null,"abstract":"<div><div>The yttria-stabilized zirconia (YSZ) coatings with 4–6 mol.% Y₂O₃ content were irradiated by 6 MeV Au ions with a fluence 6.0 <span><math><mrow><mo>×</mo></mrow></math></span> 10¹⁵ ions/cm². The cubic to monoclinic transformation of ZrO₂ was identified in the Au-irradiated samples. The cavities were observed in the YSZ layer, while larger size cavities were found inside the 6YSZ layer. LBE corrosion results showed that irradiation improved the adhesion and corrosion resistance of the coating due to the fact that irradiation released the stresses in the coating. Overall, the 4YSZ coating showed the best corrosion resistance and irradiation resistance in the case of heavy ion irradiation.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112370"},"PeriodicalIF":2.8,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664092","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":"Gamma absorption/scattering parameters and nuclear radiation shielding performance of AlSN–Zr glass system: Potential use in medical facilities","authors":"Z.A. Alrowaili ,&nbsp;M.S. Al-Buriahi","doi":"10.1016/j.radphyschem.2024.112367","DOIUrl":"10.1016/j.radphyschem.2024.112367","url":null,"abstract":"<div><div>This study investigated the glass density and gamma shielding capacity of xAl₂O₃–40SiO₂–5BaO–10Bi₂O₃–20ZrO₂-(25-x)Na₂O glass system, where x = 0, 5, and 10 mol%. This glass system was synthesized and the density of the samples increased from 2.92 g/cm³ to 3.14 g/cm³ as the Al₂O₃ content rose from 0 to 10 mol %. The mass attenuation coefficients ranged from 0.0316 to 38.9421 cm²/g for AlSN–Zr1, 0.0315–38.8504 cm²/g for AlSN–Zr2, and 0.0311–37.0391 cm²/g for AlSN–Zr3. The mean free path and half-value layer for the gamma energy spectrum were approximately 7.54–0.01 cm and 10.87–0.01 cm for AlSN–Zr1, 7.19–0.01 cm and 10.38–0.01 cm for AlSN–Zr2, and 7.14–0.01 cm and 10.31–0.01 cm for AlSN–Zr3, respectively. The effective Z values range from 14.65 to 55.13 for AlSN–Zr1, 14.41–55.74 for AlSN–Zr2, and 14.10–55.01 for AlSN–Zr3. Moreover, the Al₂O₃ content incorporation reduced photon buildup factors and improved the photon shielding performance of the glass system. Based on the results, AlSN–Zr3 demonstrated the potential to replace conventional shielding materials such as glasses, concrete, and rocks. These glasses a promising candidate for durable gamma-ray shielding applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112367"},"PeriodicalIF":2.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664146","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":"Reliability of trap-filling parameters read from OSL dose-response curves measured by procedures with sensitivity correction","authors":"Natalia K. Pawlak,&nbsp;Alicja Chruścińska","doi":"10.1016/j.radphyschem.2024.112365","DOIUrl":"10.1016/j.radphyschem.2024.112365","url":null,"abstract":"<div><div>As is known from the early stimulated luminescence studies, dose-response curves (DRCs) are not consistent with the curves of the dependence of the electron concentration in the traps on the irradiation dose delivered to a crystal, even for a system consisting of one trap and one recombination centre. However, for the optically stimulated luminescence (OSL) signal originating from more complex trap and recombination centre systems, it is often observed that the DRC can be described by a simple single saturating exponential (SSE) or a double saturating exponential (DSE) function. Using simulations, we show that although good fit compliance can often be achieved, the parameters obtained only in some cases correctly describe the relationship between the occupancy of individual traps and the dose. Simulations performed for the DRC construction procedure included a step allowing for the correction of possible changes in sensitivity. A model of two traps active in the OSL process and two recombination centres was tested. The modelling shows that the results of the DRC analysis using SSE functions strongly depend not only on the relationship of the trapping probability coefficients of traps but also on their concentrations and the concentrations of recombination centres. The shape of the DRC, and therefore the fitting parameters, also change with the annealing temperature used in the DRC measurement protocol.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112365"},"PeriodicalIF":2.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664149","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":"Effects of gamma and electron-beam irradiations on the stability of free radicals, bioactive compounds and microbial characteristics of turmeric powder","authors":"Zeinab Aghamohseni ,&nbsp;Saeideh Esmaeili ,&nbsp;Samira Berenji Ardestani ,&nbsp;Mohammad Esmaeil Akbari ,&nbsp;Amir Moslehi ,&nbsp;Elham Khanniri ,&nbsp;Marzieh Ahmadi-Roshan ,&nbsp;Amirali Anvar","doi":"10.1016/j.radphyschem.2024.112368","DOIUrl":"10.1016/j.radphyschem.2024.112368","url":null,"abstract":"<div><div>Turmeric is a functional ingredient commonly used in food, pharmaceutical, and cosmetic products due to its health benefits and bioactivity, including anti-inflammatory, antioxidant, and anticancer benefits. Irradiation is a common technique used to decontaminate microorganisms and extend the shelf life of spices. However, there are scientific debates over the use of irradiation in food products. This study aimed to assess the effects of ionizing radiation, including gamma rays and electron beams, on bioactive compounds and microbial characteristics of turmeric powder. Technically, high-performance liquid chromatography with UV–Vis detection was used to assess bioactive compounds. Another aim of the present study was to determine free radicals in irradiated and non-irradiated samples within one month of storage using electron paramagnetic resonance (EPR). Results showed that gamma and electron-beam irradiations could decrease microbial contamination of turmeric by approximately 5 and 6 log cfu/g, respectively. Contents of bioactive compounds increased in irradiated samples and curcumin contents in gamma and electron-beam irradiated samples were 232–248 and 215–266 mg/g dry weight (dw), respectively. Furthermore, the study detected that free radicals increased in all irradiated samples immediately after irradiation but decreased over time. Decrease in EPR signals was faster in gamma-irradiated samples during storage. Numbers of free radicals induced by gamma and electron-beam irradiations were 6.59–4.70, 2.69–1.60, 1.61–1.34, and 0.99–1.05 on days 0, 7, 14, and 21, respectively. After 21 days of storage, the numbers of free radicals in all non-irradiated and irradiated samples were similar. Therefore, free radicals induced by irradiations were degraded during storage and eliminated after 21 days.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112368"},"PeriodicalIF":2.8,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664091","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":"Comprehensive analysis of gamma irradiation-induced crystallographic transformations in TiC nanoparticles using X-ray diffraction techniques","authors":"Raisa R. Hakhiyeva ,&nbsp;Afsun S. Abiyev ,&nbsp;Elchin M. Huseynov","doi":"10.1016/j.radphyschem.2024.112363","DOIUrl":"10.1016/j.radphyschem.2024.112363","url":null,"abstract":"<div><div>Alterations in the structural composition of titanium carbide (TiC) nanocrystals induced by gamma radiation exposure were systematically investigated. A sample with an average grain size of approximately from 40 nm to 60 nm and possessing a cubic crystal structure (Fm3 <span><math><mrow><mover><mi>m</mi><mo>‾</mo></mover></mrow></math></span>) was selected for the experiment. The X-ray diffraction method has been employed to analyze the changes that occurred after gamma radiation. The experimental results were theoretically analyzed employing the Rietveld, Scherrer, and Williamson-Hall methods, with subsequent comparisons conducted among them. Furthermore, the degree of amorphization induced by gamma radiation throughout the structure was quantified.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112363"},"PeriodicalIF":2.8,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592682","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":"A closer look to dose assessment and radiation shielding characteristics of concrete doped magnetite irradiated with 252Cf mixed radiation radionuclide: A Watt Fission approach and Doppler effect","authors":"Roya Boudaghi Malidarreh ,&nbsp;N. Almousa ,&nbsp;Iskender Akkurt ,&nbsp;Shams A.M. Issa ,&nbsp;Hesham M.H. Zakaly","doi":"10.1016/j.radphyschem.2024.112364","DOIUrl":"10.1016/j.radphyschem.2024.112364","url":null,"abstract":"<div><div>Nuclear radiation emitted by fusion reactors, nuclear power plants, and medical establishments presents potential risks to living organisms personnel, necessitating the implementation of protective measures. To enhance radiation protection for patients workers, various materials can be utilized. Concrete, augmented with various additives, has historically acted as a shielding material. Hence, recent research has predominantly focused on enhancing concrete's ability to attenuate the harmful energy emitted by nuclear sources through modifications to its composition. Accordingly, in the present work, the dose evaluation and radiation shielding characteristics of a range of concrete magnetite (CM) formulations designated as CM-0 (control sample), CM-25, CM-50, CM-75, and CM-100 have been analyzed using MCNPX Monte Carlo (MC) approach and theoretical computations concerning ²⁵²Cf mixed radiation radionuclide. In this work, the Watt Fission distribution was employed to derive the neutron spectrum of CM samples, and findings have been thoroughly elucidated in the presence and absence of the specified samples. Then, utilizing the Doppler Effect, the gamma photon spectrum within shielding materials exposed to a spontaneous fission ²⁵²Cf source is extracted and characterized. Estimation of Half Value Thickness (HVT) and Mean Free Path (MFP) are provided across a broad spectrum of energy levels. The analysis confirms the successful development of a new type of concrete magnetite (CM) sample that exhibits lower radiation exposure compared to the control sample. This study offers valuable insights into the use of concrete in shielding against mixed radiation radionuclides and opens the door for future research involving similar materials. Specifically, the CM-100 sample demonstrated the lowest half-value thickness (HVT) and provided the most effective reduction of both neutron and gamma radiation. The findings suggest that increasing the concentration of magnetite in concrete greatly enhances its ability to shield against mixed neutron-gamma radiation. This innovation has promising potential for applications in radiation protection, particularly within nuclear reactors and medical facilities. The CM-100 sample showed a notable improvement, achieving an HVT of 0.012 cm and a dose rate reduction of 2.95 × 10⁻⁹ Sv.h⁻¹, in contrast to the control sample (CM-0), which had an HVT of 10.358 cm and an equivalent dose rate of 2.84 × 10⁻⁹ Sv.h⁻¹. These results underscore the superior shielding properties of the magnetite-doped concrete formulations.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112364"},"PeriodicalIF":2.8,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664153","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":"Excitation functions for Sc radioisotopes production via (α,x) nuclear reactions on natural calcium up to 25 MeV","authors":"Lutfi A. Hasnowo ,&nbsp;Alexander A. Garapatski ,&nbsp;Nelson E. Villa ,&nbsp;Maria S. Larkina ,&nbsp;Ivan V. Lomov ,&nbsp;Mekhman S. Yusubov","doi":"10.1016/j.radphyschem.2024.112361","DOIUrl":"10.1016/j.radphyschem.2024.112361","url":null,"abstract":"<div><div>Scandium (Sc) radioisotopes have been attracting increasing attention in medical applications. ⁴⁷Sc, which has the potential for targeted radiotherapy, is quite promising as a candidate for theranostic pairing with the β⁺-emitting radioisotope ⁴³Sc or ^44gSc. The excitation functions for producing ^{43,44m,44g,46,47}Sc through (α,x) reactions on natural calcium (Ca) up to an energy of 25 MeV were experimentally measured and critically compared with previous experimental reports and theoretical data obtained by EMPIRE-3.2.3 code and from TENDL-2021 library. The physical yields for producing of ^{43,44m,44g,46,47}Sc through (α,x) reactions on ^natCa were determined using the measured production cross-section of the radionuclides and the stopping powers.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112361"},"PeriodicalIF":2.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664151","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":"Study of a gel dosimeter based on Ag nanoparticles for applications in radiation therapy with synchrotron X-rays at ultrahigh dose rate compared to 60Co γ-rays","authors":"Yasser S. Soliman ,&nbsp;Marie Capron ,&nbsp;Diego Pontoni ,&nbsp;Michael Krisch ,&nbsp;Paolo Pellicioli","doi":"10.1016/j.radphyschem.2024.112351","DOIUrl":"10.1016/j.radphyschem.2024.112351","url":null,"abstract":"<div><div>A silver nitrate (AgNO₃) gel was developed and evaluated as a dosimeter for synchrotron X-ray-based studies in microbeam radiation therapy (MRT) and FLASH radiation therapy. The gel was irradiated at the European Synchrotron Radiation Facility (ID17 Biomedical beamline) with a continuous X-ray spectrum in the 50–600 keV range and a dose rate of 11.6 kGy/s. The spectrophotometric response after irradiation at this beamline was compared with the response at a conventional ⁶⁰Co γ-ray source providing a dose rate of 0.27 Gy/s. Ag ⁺ ions in the gel dosimeter undergo reduction to Ag^o nanoparticles, as detected at 450 nm, which is a surface plasmon resonance band. The intensity of this band increased linearly with increasing absorbed dose up to 100 Gy, and improved with the addition of glycerol. The gel dosimeter exhibited the lowest detectable dose (LDD) of 75.9% lower and a dose deposition of 76% higher for ID17 beamline irradiation than for ⁶⁰Co irradiation. The theoretical relative response H_Q,Qo for the gel irradiated at the synchrotron was 1.70, which is in close agreement with the experimental relative response F_Q,Qo = 1.76. These results confirm the dose enhancement in the gel irradiated with orthovoltage X-rays. The good properties of the silver nitrate gel, together with its increased sensitivity to orthovoltage X-ray irradiation and modest overall uncertainty of 5.8% (2σ), confirm that the gel is a valid dosimeter for measurements at ultrahigh dose rates for synchrotron radiotherapy. The dosimeter is also a promising candidate for dose enhancement factor measurements in nanoparticle-based radiotherapy techniques.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112351"},"PeriodicalIF":2.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664152","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}