Radiation Physics and Chemistry最新文献_第4页

Spectra and dosimetric features of Shape Memory Alloys moderated 241Am–Be neutron sources for calibration 形状记忆合金慢化241Am-Be中子源的光谱和剂量学特性

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-02-01 DOI: 10.1016/j.radphyschem.2026.113686

Hector Rene Vega-Carrillo , Samah A. Al-Shelkamy , Claudia Angelica Marquez-Mata , Carina Oliva Torres-Cortes , Victor Martin Hernandez-Davila , Miguel Angel Salas-Luevano

Seven shape memory alloys, together with AISI 321 stainless steel and polyethylene, were investigated as moderators for a²⁴¹Am–Be neutron source. Monte Carlo simulations were performed to estimate the neutron spectra at 100 cm from the source, with the aim of producing realistic neutron radiation fields comprising thermal, epithermal, and fast neutrons suitable for calibration of neutron radiation protection instruments. In addition, γ-ray spectra induced by neutron interactions with, the source, alloy, steel, and polyethylene nuclei were evaluated. Using the calculated neutron spectra, the ambient dose equivalent, isotropic effective dose, and ambient dose were determined, while the ambient dose equivalent and ambient dose were also calculated for the γ-ray spectra. The neutron spectra of alloy-moderated ²⁴¹Am–Be sources, including configurations with thin and thick polyethylene shells, exhibited neutron absorption features associated with ⁵⁵Mn present in all alloys. Neutron spectra produced by thin and thick alloy shell–polyethylene moderated ²⁴¹Am–Be sources showed well-defined thermal, epithermal, and fast neutron components, with mean neutron energies ranging from 1.53 to 2.48 MeV. Among the investigated configurations, the thick A_SH4P/²⁴¹Am–Be source produced the highest neutron fluence, with a mean energy of approximately 2.16 MeV and a balanced contribution of thermal, epithermal, and fast neutrons. These results demonstrate that shape memory alloys, in combination with polyethylene, can be effectively used to tailor ²⁴¹Am–Be neutron fields, enabling the generation of realistic spectral and dosimetric characteristics suitable for extending the calibration capabilities of neutron calibration facilities.

研究了7种形状记忆合金、AISI 321不锈钢和聚乙烯作为a241Am-Be中子源的慢化剂。通过蒙特卡罗模拟，估算了距离源100 cm处的中子能谱，目的是产生适合于中子辐射防护仪器校准的真实中子辐射场，包括热中子、超热中子和快中子。此外，对中子与源核、合金核、钢核和聚乙烯核相互作用产生的γ射线能谱进行了评价。利用计算的中子能谱，确定了环境剂量当量、各向同性有效剂量和环境剂量，并计算了γ射线能谱的环境剂量当量和环境剂量。合金慢化241Am-Be源（包括薄聚乙烯和厚聚乙烯外壳）的中子谱显示出与所有合金中存在的55Mn相关的中子吸收特征。由薄和厚合金壳聚乙烯慢化241Am-Be源产生的中子能谱显示出明确的热中子、超热中子和快中子成分，平均中子能在1.53 ~ 2.48 MeV之间。在所研究的构型中，较厚的ASH4P/ 241Am-Be源产生的中子通量最高，平均能量约为2.16 MeV，热中子、超热中子和快中子的贡献平衡。这些结果表明，形状记忆合金与聚乙烯结合，可以有效地用于定制241Am-Be中子场，从而产生真实的光谱和剂量学特征，适合扩展中子校准设施的校准能力。

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引用次数: 0

Implementing VMAT for Total Body Irradiation in a 3-Year-Old Patient: Clinical Workflow and Positioning Challenges 对一名3岁患者实施VMAT全身照射：临床工作流程和定位挑战

IF 2.9 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-31 DOI: 10.1016/j.radphyschem.2026.113650

Shahad Alrushud, Amjad Almutairi, Madhawi Alkahtani, Hiba Omer, Hind Toufig, Ali Alghamdi

引用次数: 0

Validating photon beam delivery by 3D-printed head phantom 验证光子束传输的3d打印头部幻影

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-31 DOI: 10.1016/j.radphyschem.2026.113683

Daria Polomoshnova , Angelina Bulavskaya , Irina Miloichikova , Faustina Ntim Opoku , Sergei Stuchebrov

The precise delivery of radiation dose to tumors while sparing healthy tissues is a cornerstone of effective radiotherapy, demanding rigorous pre-treatment validation. Dosimetric phantoms are essential tools for this validation, yet conventional designs often lack anatomical realism. This study addresses the need for more patient-specific and accessible quality assurance tools by developing and evaluating a 3D-printed head phantom. It was hypothesized that a universal head phantom fabricated via fused filament fabrication from polylactic acid could provide dosimetric accuracy comparable to clinical standards. The phantom was designed, printed, and then underwent a full cycle of radiation therapy: CT simulation, planning of radiation therapy with intensity modulation (IMRT) and arc modulation (VMAT), irradiation with photon beams of 6 and 10 MeV. Dose was measured using a farmer-type ionization chamber and radiochromic films. The results showed excellent agreement between measured and planned doses, with deviations of less than 1% for point measurements and a gamma analysis passing rate exceeding 95% (3%/3 mm criteria) for 2D dose distributions. These findings confirm that the developed 3D-printed phantom is a reliable and versatile tool, demonstrating significant potential for enhancing quality assurance procedures in clinical radiotherapy and for facilitating controlled dosimetric research.

在不影响健康组织的情况下，精确地向肿瘤输送辐射剂量是有效放疗的基石，需要严格的治疗前验证。剂量学模型是这种验证的必要工具，但传统的设计往往缺乏解剖学的真实性。本研究通过开发和评估3d打印头部幻影，解决了对更多患者特异性和可访问的质量保证工具的需求。假设通过聚乳酸熔丝制造的通用头部假体可以提供与临床标准相当的剂量学准确性。该模型经过设计、打印，然后进行了完整的放射治疗周期：CT模拟、强度调制（IMRT）和电弧调制（VMAT）的放射治疗计划、6和10 MeV的光子束照射。剂量测量使用农民式电离室和放射性致变色膜。结果显示，测量剂量与计划剂量之间的一致性非常好，点测量的偏差小于1%，二维剂量分布的伽马分析合格率超过95% （3%/ 3mm标准）。这些发现证实，所开发的3d打印幻影是一种可靠和通用的工具，在提高临床放疗质量保证程序和促进受控剂量学研究方面显示出巨大的潜力。

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引用次数: 0

Enhanced radon and thoron-barrier performance of ambient‒curable natural rubber latex for sustainable building material coatings 环境固化天然胶乳在可持续建筑材料涂料中的防氡防刺性能

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-31 DOI: 10.1016/j.radphyschem.2026.113680

Worawat Poltabtim , Suchart Kothan , Tarika Thumvijit , Chayanit Jumpee , Siriprapa Somboon , Benjamaporn Supawat , Phannavich Malawan , Kiadtisak Saenboonruang

The release of radon and thoron from building materials is presently a concern as a source of indoor radiation exposure, which causes substantial long-term health risks to the public. This research presented a novel sustainable radon barrier based on natural rubber latex (NRL) emulsion coating, which was crosslinked using glutaraldehyde and filled with varying contents of silicon dioxide (SiO₂) or activated carbon (AC). The emulsion was coated (0.20 ± 0.10 mm dry thickness) on clay bricks and subsequently evaluated for their ability to mitigate radon and thoron exhalation. The results showed that the 10-phr SiO₂-filled sample achieved the highest radon mitigation efficiency of 60.3% in surface radon exhalation rate relative to the uncoated condition, while all formulations, including pristine NRL, achieved thoron suppression efficiencies greater than 92%. Furthermore, simulated dose assessments confirmed the coating's effectiveness in reducing annual effective dose (AED) from indoor radon, with further reductions to 0.10–0.15 mSv·y⁻¹ achieved under ventilated scenarios. Beyond radon and thoron barrier performance, SiO₂ incorporation markedly enhanced mechanical robustness and abrasion resistance, while AC improved coating elasticity, although high AC contents led to agglomeration and reduced film uniformity. These findings highlight the potential of sustainable, ambient-curable NRL coatings as effective practical and durable barriers against indoor radon and thoron for green building applications.

建筑材料释放的氡和钍目前是一个令人关注的问题，是室内辐射暴露的一个来源，对公众的健康造成重大的长期风险。采用戊二醛交联天然胶乳（NRL）乳液涂层，填充不同含量的二氧化硅（SiO2）或活性炭（AC），制备了一种新型的可持续氡屏障。将乳液（干厚度0.20±0.10 mm）涂在粘土砖上，随后评估其减轻氡和钍呼出的能力。结果表明，相对于未包覆条件，10-phr sio2填充样品的表面氡呼出率达到60.3%的最高氡抑制效率，而包括原始NRL在内的所有配方的氡抑制效率均大于92%。此外，模拟剂量评估证实了涂层在降低室内氡年有效剂量（AED）方面的有效性，在通风情况下进一步降低至0.10-0.15 mSv·y - 1。除了氡和钍的阻隔性能外，SiO2的掺入显著提高了涂层的机械坚固性和耐磨性，而AC的掺入提高了涂层的弹性，尽管高AC含量会导致团聚并降低膜的均匀性。这些发现强调了可持续的、环境固化的NRL涂料作为有效的、实用的、耐用的室内氡和钍屏障的潜力，用于绿色建筑应用。

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引用次数: 0

α-LiIO3 single crystals grown from aqueous solutions containing L-Alanine and glycine 从含有l -丙氨酸和甘氨酸的水溶液中生长α-LiIO3单晶

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-31 DOI: 10.1016/j.radphyschem.2026.113685

Astghik Danghyan, Ruzan Sukiasyan, Ruben Apreyan, Liana Bezhanova, Nelli Gharibyan, Armen Atanesyan

The present study focuses on the growth and investigation of pure α-LiIO₃ single crystals, as well as single crystals of α-LiIO₃ grown from aqueous solutions containing amino acids L-alanine (L-Ala) and Glycine (Gly), using the slow evaporation solution growth technique. An attempt was made to grow α-LiIO₃ crystals from an aqueous solution of lithium iodate containing amino acids to enhance the nonlinear optical and mechanical properties of α-LiIO₃ crystals suitable for both academic and industrial applications. The grown bulk crystals were characterized by means of several complementary techniques, such as optical spectroscopy, IR spectroscopy, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), and measurements of the second harmonic generation efficiency. In the presence of an amino acid in the solution, an increase in the rate of crystal growth was experimentally observed. In the IR spectra of α-LiIO₃:L-Ala and α-LiIO₃:Gly crystals, absorption bands appear that are absent in pure lithium iodate, but are characteristic of amino acids. The lattice parameters of the grown crystals were confirmed through the X-ray technique. Single crystal X-ray and powder X-ray diffraction measurements revealed that pure, as well as α-LiIO₃:L-Ala and α-LiIO₃:Gly crystals maintained a hexagonal structure, remaining single-phase within the amino acid's concentration range (5 mol%), indicating that the presence of L-Ala and Gly in solution does not violate the parameters of the crystal lattice. It was obtained that the second harmonic generation activity of the α-LiIO₃:L-Ala and α-LiIO₃:Gly crystals is higher than that of the pure α-LiIO₃ crystal. The enhancement of the optical properties of α-LiIO₃:L-Ala and α-LiIO₃:Gly crystals in comparison with pure LiIO₃ has been precisely examined by UV–Visible spectral analysis within the wavelength range of 280–800 nm. UV–Visible spectral analysis is also used to evaluate the band gap.

本研究主要研究了纯α-LiIO3单晶的生长和研究，以及采用慢蒸发溶液生长技术在含有l -丙氨酸（L-Ala）和甘氨酸（Gly）的水溶液中生长α-LiIO3单晶。为了提高α-LiIO3晶体的非线性光学和力学性能，我们尝试在含氨基酸的碘酸锂水溶液中生长α-LiIO3晶体，以适应学术和工业应用。利用光谱学、红外光谱、单晶x射线衍射、粉末x射线衍射（PXRD）和二次谐波产生效率等互补技术对生长的块状晶体进行了表征。在溶液中存在氨基酸时，实验观察到晶体生长速率的增加。在α-LiIO3:L-Ala和α-LiIO3:Gly晶体的红外光谱中，出现了纯碘酸锂所没有的吸收带，这是氨基酸的特征。通过x射线技术确定了生长晶体的晶格参数。单晶x射线衍射和粉末x射线衍射测量表明，纯α-LiIO3:L-Ala和α-LiIO3:Gly晶体保持六方结构，在氨基酸浓度范围（5 mol%）内保持单相，表明溶液中L-Ala和Gly的存在不违反晶格参数。结果表明，α-LiIO3:L-Ala和α-LiIO3:Gly晶体的二次谐波生成活性高于纯α-LiIO3晶体。在280 ~ 800 nm波长范围内，通过紫外可见光谱分析，精确地考察了α-LiIO3:L-Ala和α-LiIO3:Gly晶体与纯LiIO3晶体相比，光学性能的增强。紫外可见光谱分析也用于评价带隙。

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引用次数: 0

Radionuclide adsorption and natural radioactivity in microplastics: An emerging toxicological hazard 微塑料中的放射性核素吸附和天然放射性：一种新出现的毒理学危害

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-31 DOI: 10.1016/j.radphyschem.2026.113677

Akbar Abbasi , Mayeen Uddin Khandaker , Fatemeh Mirekhtiary

To unveil the natural radioactivity levels in various types of petrochemical-derived microplastics (MPs), a study was conducted using a gamma spectrometry system to measure ²²⁶Ra, ²³²Th, and ⁴⁰K in microplastics. The maximum value of all measured radionuclides was observed in polyethylene terephthalate (PET) microplastic samples. The measured activity concentrations ranged from values below the minimum detectable limit (MDA = 2 Bq·kg⁻¹) up to 5.14 ± 0.11 Bq·kg⁻¹ for ²²⁶Ra, from below the MDA (2.5 Bq·kg⁻¹) up to 3.17 ± 0.04 Bq·kg⁻¹ for ²³²Th, and from 15.18 ± 0.08 Bq·kg⁻¹ to 47.14 ± 1.85 Bq·kg⁻¹ for ⁴⁰K. The interactions between Uranium-232 (²³²U) and Cesium-137 (¹³⁷Cs) with commonly used microplastics in the food industry have been explored in aqueous environments that mimic seawater and freshwater. Various physicochemical conditions, including temperature (T) and pH, were analyzed to determine the adsorption coefficient (K_d). The experiments were performed at different pH levels (6, 8.5), and the adsorption efficiency was evaluated primarily as a function of temperature (20, 28, 35 °C). The highest K_d for both uranium (0.284 ± 0.014 Bq kg⁻¹) and Cesium (0.107 ± 0.009 Bq kg⁻¹) was observed in freshwater at T = 20 °C, pH = 6, and T = 20 °C, pH = 8.5, respectively. This research demonstrated that the ²³²U adsorption coefficient by PET was higher than that of ¹³⁷Cs in freshwater and seawater environments.

为了揭示各种石化衍生微塑料（MPs）中的天然放射性水平，研究人员使用伽马能谱系统测量微塑料中的226Ra， 232Th和40K。在聚对苯二甲酸乙二醇酯（PET）微塑料样品中观察到所有测量的放射性核素的最大值。测得的活性浓度范围为：226Ra低于最低检测限（MDA = 2 Bq·kg - 1）至5.14±0.11 Bq·kg - 1, 232Th低于MDA （2.5 Bq·kg - 1）至3.17±0.04 Bq·kg - 1, 40K为15.18±0.08 Bq·kg - 1至47.14±1.85 Bq·kg - 1。在模拟海水和淡水的水环境中，研究了铀-232 （232U）和铯-137 （137Cs）与食品工业中常用的微塑料之间的相互作用。分析了不同的物理化学条件，包括温度(T)和pH，以确定吸附系数（Kd）。实验在不同的pH值（6、8.5）下进行，吸附效率主要作为温度（20、28、35°C）的函数进行评估。在T = 20°C, pH = 6和T = 20°C, pH = 8.5的淡水中，铀和铯的Kd值分别为0.284±0.014 Bq kg - 1和0.107±0.009 Bq kg - 1。研究表明，在淡水和海水环境中，PET对232U的吸附系数高于137Cs。

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引用次数: 0

Experimental and theoretical insights into Ce3+-doped optical fiber luminescence mechanisms under X-rays x射线下掺Ce3+光纤发光机理的实验与理论研究

IF 2.9 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-31 DOI: 10.1016/j.radphyschem.2026.113675

Ismail Zghari, Hicham El Hamzaoui, Adriana Morana, Youcef Ouerdane, Bruno Capoen, Sylvain Girard, Aziz Boukenter, Mohamed Bouazaoui

引用次数: 0

Effect of Europium oxide on structural, mechanical, optical, and radiation shielding properties of silver–doped oxyfluoro phospho–silicate glasses 氧化铕对掺银氟氧磷硅酸盐玻璃结构、机械、光学和辐射屏蔽性能的影响

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-30 DOI: 10.1016/j.radphyschem.2026.113678

S.A. Bassam , K.A. Naseer , C.S. Suchand Sangeeth , Mohammed S. Alqahtani , Muhammed Arshad Thottappali , Mayeen Uddin Khandaker , E. El Shiekh

Five distinctive series of glasses were synthesized to investigate the effect of Eu³⁺ ions on the structural, elastic, optical, and gamma–ray shielding properties of the silver–doped alkaline oxyfluro phospho–silicate glasses, featuring a nominal composition of 50P₂O₅ + 15SiO₂ + 10BaF₂ + 10SrF₂ + (15−X) AgNO₃ + XEu₂O₃, where (X = 0.1, 0.5, 1, 1.5, and 3 wt%). The preparation was carried out with the traditional melt–quench technique, and the presence of an amorphous nature was confirmed through the XRD spectrum. The functional groups present in the glass network were identified utilizing the FTIR spectra. Some of the physical, structural, and elastic properties of the glasses were evaluated. The inclusion of Eu³⁺ ions densifies the glass matrix which significantly increases the density (2.061–2.308 g/cm³), refractive index (1.672–1.766), and elastic moduli (Young's modulus 54.1–104.1 GPa) while decreasing the molar volume (99.373–91.026 cm³/mol). These glasses are suitable for radiation shielding applications due to their enhanced effectiveness in attenuating high–energy radiation, as demonstrated by the increase in mass attenuation coefficient (MAC, up to 5.678 cm²/g at 0.0395 MeV) and the reduction in both direct (3.221–3.125 eV) and indirect (2.608–2.463 eV) optical band gaps, which indicate improved photon absorption. The results showed that the glass with the highest Eu₂O₃ content has the highest mass attenuation coefficient and thus has the best attenuation performance.

为了研究Eu3+离子对掺银碱性氧氟磷硅酸盐玻璃的结构、弹性、光学和伽马射线屏蔽性能的影响，合成了五种不同系列的玻璃，其公称组成为50P2O5 + 15SiO2 + 10BaF2 + 10SrF2 +(15−X) AgNO3 + XEu2O3，其中（X = 0.1, 0.5, 1,1.5和3wt %）。采用传统的熔融淬火工艺进行制备，并通过XRD谱分析证实了材料的无定形性质。利用FTIR光谱确定了玻璃网络中的官能团。对玻璃的一些物理、结构和弹性性能进行了评价。Eu3+离子的加入使玻璃基体致密化，使其密度（2.061 ~ 2.308 g/cm3）、折射率（1.672 ~ 1.766）和弹性模量（杨氏模量54.1 ~ 104.1 GPa）显著增加，而摩尔体积（99.373 ~ 91.026 cm3/mol）显著减小。这些玻璃适合于辐射屏蔽应用，因为它们在衰减高能辐射方面具有增强的有效性，如质量衰减系数（MAC，在0.0395 MeV时高达5.678 cm2/g）的增加和直接（3.221-3.125 eV）和间接（2.608-2.463 eV）光学带隙的减小，这表明光子吸收得到了改善。结果表明，Eu2O3含量最高的玻璃具有最高的质量衰减系数，因此具有最佳的衰减性能。

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引用次数: 0

Gamma irradiation-induced enhancement of agar-based bioplastics incorporating poly(lactic acid) and poly(butylene adipate-co-terephthalate) γ射线辐照增强聚乳酸和聚己二酸丁二醇-对苯二甲酸酯的琼脂基生物塑料

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-30 DOI: 10.1016/j.radphyschem.2026.113673

Angelica Isabella Christian , Farah Nurlidar , Dien Puji Rahayu , Ade Lestari Yunus , Tita Puspitasari , Yudi Nugraha Thaha , Lutviasari Nuraini , Rossy Choreun Nissa , Yeyen Nurhamiyah

This study explores the fabrication of biodegradable bioplastics based on agar, poly(lactic acid) (PLA), and poly(butylene adipate-co-terephthalate) (PBAT), enhanced through cobalt-60 gamma irradiation to improve their mechanical, thermal, and degradation behavior. A range of irradiation doses (0–50 kGy) was applied to evaluate the effects of crosslinking and chain scission on material performance. The tensile strength showed a marked improvement, increasing from 2.72 ± 1.94 MPa (0 kGy) to 6.01 ± 0.92 MPa at 30 kGy, indicating enhanced mechanical integrity due to effective crosslinking. In parallel, water absorption decreased dramatically from 83.03% to 15.22%, reflecting a significant reduction in hydrophilicity. At higher doses, degradation processes became more prominent, as evidenced by increased melt flow rate and biodegradability. These findings demonstrate that controlled gamma irradiation is an effective approach to fine-tune the performance and environmental responsiveness of agar-based bioplastics, making them more suitable for sustainable packaging and related applications.

本研究探索了基于琼脂、聚乳酸（PLA）和聚己二酸丁二醇酯（PBAT）的可生物降解生物塑料的制备，并通过钴-60 γ辐射增强以改善其机械、热和降解行为。采用0-50 kGy辐照剂量范围评价交联和断链对材料性能的影响。拉伸强度明显提高，从2.72±1.94 MPa （0 kGy）增加到6.01±0.92 MPa (30 kGy)，表明有效交联提高了机械完整性。同时，吸水率从83.03%急剧下降到15.22%，反映亲水性显著降低。在较高的剂量下，降解过程变得更加突出，如增加的熔体流动速率和生物降解性所证明的那样。这些发现表明，受控伽马辐射是一种有效的方法，可以微调琼脂基生物塑料的性能和环境响应性，使其更适合可持续包装和相关应用。

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引用次数: 0

Enhanced sono-radio dynamic therapy of non-small cell lung cancer using a polydopamine coated manganese dioxide-gold nanosystem: reactive oxygen species amplification and tumor microenvironment modulation 使用聚多巴胺包被二氧化锰-金纳米系统增强非小细胞肺癌的声放动态治疗：活性氧扩增和肿瘤微环境调节

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry

Pub Date : 2026-01-29 DOI: 10.1016/j.radphyschem.2026.113648

F. Mortazavi , H. Haghighi , P. Tamaddon , A. Ketabi , H. Heli , N. Sattarahmady

Radiotherapy (RT) and sonodynamic therapy (SDT) are reactive oxygen species (ROS)-dependent cancer treatments that suffer from limited efficacy in hypoxic and glutathione (GSH)-rich tumor microenvironments (TMEs). In this study, we developed and characterized a multifunctional polydopamine coated manganese dioxide-gold nanosystem (GMnD) as a dual sensitizer to enhance the therapeutic outcomes of RT and SDT in non-small cell lung carcinoma (NSCLC). Polydopamine coating enhanced the biocompatibility of the nanosystem and imparts stimuli-responsive properties. GMnD exhibited broad optical absorptions (visible to near-infrared), a narrow band gap (1.1 eV), and a high sonothermal conversion efficiency (80.7 %), enabling strong electromagnetic sensitization. On A549 NSCLC cells, the nanosystem in combination with ultrasound (US) and RT significantly increased ROS generation, and induced mitochondrial dysfunction, GSH depletion, catalase-like activity, and sonoporation. These effects led to synergistic cytotoxicity, correlating with mitochondrial membrane potential loss and decreased cell viability. In overall, GMnD presented a promising strategy for improving ROS-mediated combination therapy by modulating the hypoxic TME and disrupting mitochondrial redox balance.

放射治疗（RT）和声动力治疗（SDT）是依赖活性氧（ROS）的癌症治疗方法，在缺氧和谷胱甘肽（GSH）丰富的肿瘤微环境（TMEs）中疗效有限。在这项研究中，我们开发并表征了一种多功能多多巴胺包被二氧化锰-金纳米系统（GMnD）作为双重增敏剂，以提高RT和SDT治疗非小细胞肺癌（NSCLC）的疗效。聚多巴胺包被增强了纳米系统的生物相容性，并赋予其刺激响应特性。GMnD具有广泛的光学吸收（可见光到近红外），窄带隙（1.1 eV）和高声热转换效率（80.7%），具有强的电磁敏化能力。在A549 NSCLC细胞中，纳米系统联合超声（US）和RT显著增加ROS的产生，并诱导线粒体功能障碍、GSH消耗、过氧化氢酶样活性和超声穿孔。这些作用导致协同细胞毒性，与线粒体膜电位损失和细胞活力下降有关。总体而言，GMnD通过调节缺氧TME和破坏线粒体氧化还原平衡，为改善ros介导的联合治疗提供了一种有希望的策略。

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引用次数: 0