ACS Applied Optical Materials
·
2024
·
IF 0
Xunsheng Zhou,Binqing Zhao,Lu Yao,Wanting Gui,Longfei Chen,Chao Li,Shi Zhang,Cai Lin Wang
Eutectic scintillators with 6Li-containing thermal neutron absorbers are capable of efficient thermal neutron detection due to lamellar or rod-like optical waveguide structures formed by directional solidification. However, developing stable and bright eutectic scintillators with excellent neutron imaging capability remains a challenge. Here, the performance parameters for the scintillator have been substantially improved by the Al3+ codoping strategy in the LiF-CaF2:Eu2+ system. Due to the Al3+ codoping, the photoluminescence quantum yield (PLQY) is enhanced from 55% to 80%, the light yield is increased from 11,000 to 16,000 photons/thermal neutron, and the scintillation decay time is shortened by about 30 ns. It was shown that Al3+ codoping can effectively reduce the low-frequency shallow-energy level traps. Furthermore, large-sized (50 × 50 × 1.5 mm) translucent LiF-CaF2:Eu2+, Al3+ eutectic ceramics have been fabricated for an Anger-logic position-sensitive detector to realize two-dimensional (2D) thermal neutron detection. A codoped LiF-CaF2 eutectic scintillator provides a ∼1 mm spatial resolution and thermal neutron detection efficiency 16% higher than that of a commercial GS20 scintillator. This research paves the way for the application of large-area eutectic scintillators for efficient thermal neutron detection.
研究领域:
材料科学
·
核物理
·
光学
✓ 已验证
DOI
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 7
·2108857
·
IF 18.808
Dou Zhao,Pingkun Cai,Wei Cheng,Wenbao Jia,Binbin Zhang,Menghua Zhu,Linyue Liu,Xiaoping Ouyang,Paul Sellin,Wanqi Jie,Yadong Xu
Fast neutron detection is significant for neutron imaging and flux monitoring but cannot be directly achieved by inorganic semiconductors. The traditional detection is mainly mediated by an organic scintillator and a coupled photodetector, resulting in signal losses. Here, a direct detection method for fast neutrons is demonstrated based on organic semiconducting single crystals (OSSCs) detectors. Methyl 4-hydroxybenzoate (4MHB, C 6 H 5 O-COOCH 3 ) and 4-hydroxycyanobenzene (4HCB, C 6 H 5 O-CN). The organic semiconductor acts as a fast neutron sensitive material due to its high hydrogen density, simultaneously as a semiconductor that generates the electric signal. The detectors based on 4MHB crystals can quantitatively measure the dose and energy of the fast neutron flux with a response time of 0.5 µs and detection efficiency of 78.5% cm −3 . Effects of functional groups on fast neutron detection performances are also investigated as a guideline to synthesis new molecules for this purpose. Furthermore, neutron radiation effects on these detectors are investigated. Hydrogen-related point defects are generated by fast neutrons, but device performances remain robust after irradiation of 10 13 n cm −2 fast neutrons. This study demonstrates that OSSCs show great potential as direct fast neutron detectors and particularly have highly-localized and tissue-equivalent properties that benefit neutron imaging and cancer therapy applications.
研究领域:
物理学
·
材料科学
·
医学应用
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2021
·
IF 2.161
Yumin He,Pengcheng Li,Haohao Ren,Xi Zhang,Xiulian Chen,Yonggang Yan
A series of neutron absorbing materials with good neutron absorbing capacity, high strength and good thermal property were designed and prepared in this work. First of all, polyphenylene sulfide containing different mole content of salicylic acid (SAPPS) in the main chain was synthesized by nucleophilic substitution polymerization under high pressure. Then the composites with different content of nano Gd2O3 and modified PPS were prepared by melt blending method. The testing results indicated that the copolymers SAPPS were synthesized successfully, there was an interface interaction between nano Gd2O3 and the matrix without the need for surfactants or coupling agents. Additionally, the content of nano Gd2O3 had no obvious influence on the thermal property of the composites. While following with the increase of the content of nano Gd2O3, the tensile strength of the composites increased firstly and then decreased, when the content of nano Gd2O3 was 10 wt%, the tensile strength of 10%Gd2O3/5%SAPPS reached the maximum value of 74.9 MPa. The results of neutron shielding testing indicated that the content of nano-particles had a large effect on the neutron shielding rate of composites. The neutron shielding rate of 50%Gd2O3/5%SAPPS composite was up to 83%. All of these results indicated that the Gd2O3/5%SAPPS had potential to be applied to the high-temperature resistance and thermal shielding materials in nuclear and aerospace applications.
研究领域:
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 17
·3714-3723
·
IF 5
Lu Yao,Wanting Gui,Xunsheng Zhou,Chao Li,Shi Zhang,Jing Kui Zhao,Cai Lin Wang
All-inorganic lead-free perovskite scintillators have attracted wide applications in X-ray imaging recently due to their low cost, high resolution, and environmental friendliness. However, their potential application in thermal neutron detection has yet to be thoroughly explored. In this article, the properties of all-inorganic perovskite Cs3Cu2I5 scintillators for thermal neutron detection have been investigated. A simple synthesis process has been applied to produce Cs3Cu2I5 scintillators. The as-prepared Cs3Cu2I5 crystals exhibit intense blue emission with a photoluminescence quantum yield (PLQY) of 60.3%. A composite of 6LiF, Cs3Cu2I5, and poly(methyl methacrylate) (PMMA) has been utilized for thermal neutron detection, which has a light yield of about 28 000 photons per thermal neutron, four times that of a commercial 6Li-glass (GS20) scintillator (7000 photons per thermal neutron). Effective neutron-gamma-pulse-discrimination has been achieved using a network-dynamics digital filter, effectively separating thermal neutrons from gamma events. Our composite scintillators have a high thermal neutron absorption efficiency of about 60%. In addition, Cs3Cu2I5 crystals are more sensitive to X-ray irradiation compared to commercial Na-doped CsI scintillators. Our work provides a new strategy for large-scale perovskite-based thermal neutron detection and imaging.
研究领域:
材料科学
·
核技术应用
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Tong Zheng,Wenjie Li,Haibin Sun,Zhenhao Zhang,Yujun Zhang,Yurun Feng,Qiangqiang Hu,Xue Guo
Dy 2 TiO 5 ceramics with small grain size range of 1.5–3 μm were successfully prepared by microwave sintering method. The phase composition, microstructure, thermal expansion, stability, corrosion resistance and neutron absorption properties of Dy 2 TiO 5 ceramics were investigated. The results show that Dy 2 TiO 5 ceramics possess high mechanical properties due to the small grain size, with a microhardness of 12.26 GPa. The addition of Mo significantly reduces the thermal expansion phenomenon of the sample. The oxide film formed on the surface of the Dy 2 TiO 5 ceramic enhances its excellent corrosion resistance. In addition, the Dy 2 TiO 5 ceramic shows excellent neutron absorption with 87.34% neutron absorption and over 94% thermal neutron absorption in 8 cm thick particles.
研究领域:
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2021
·
IF 1.513
Oussama Mehelli,Mehdi Derradji,Raouf Belgacemi,Slimane Abdous,Abdelmalek Habes,Wenbin Liu
Aiming the development of advanced and lightweight thermal neutrons shields, a new hybrid composite was developed from UHMWPE fibers, epoxy and boron carbide (B 4 C) particles. The UHMWPE fibres were chosen because of their high hydrogen contents and exceptional mechanical properties. The neutrons shielding tests were performed using an optimized experimental setup at NUR research reactor, Algiers. Overall, the developed materials displayed remarkable neutrons screening performances. Meanwhile, the best performance was recorded at B 4 C amount of 20 wt% with a macroscopic cross-section (Σ) of with a 0.313 cm −1 equivalent to a mean free path (λ) of 2.2 cm.
研究领域:
材料科学
·
核工程
·
复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Crystals
·
2019
·Vol. 9
·期 10
·512
·
IF 2.061
Xiuhua Liu,Tonghua Zhu,Qingyuan Hu,Lan Dong,Zhaoyi Tan
9,10-diphenylanthracene (DPA) single crystal is a promising scintillator material for fast-neutron detection. Two centimetre-sized polymorph crystals of DPA were grown by melting and solution methods (DPA-Melt and DPA-Solution, respectively), and characterised by single-crystal X-ray diffraction, Raman spectroscopy, Fourier-transform infrared spectroscopy, fluorescence spectroscopy, UV-Vis absorbance spectroscopy, and thermogravimetric/differential scanning calorimetry. The DPA-Melt crystal possessed a P21/n structure, with excitation bands at approximately 331, 348, 367, and 387 nm, and the strongest emission wavelength at approximately 454 nm. On the other hand, the DPA-Solution crystal possessed a C2/c structure, with excitation bands at approximately 335, 353, 372, and 396 nm, and the strongest emission wavelength at approximately 468 nm. The two kinds of DPA crystals have the same molecular formula but different crystal structures, crystal lattice constants, and cell parameters. The theoretical density of the DPA-Solution crystal was 1.239 g/cm3, while that of the DPA-Melt crystal was 1.211 g/cm3. The two types of crystals exhibited the same melting point, but the thermal stability of the DPA-Solution crystal is better than that of the DPA-Melt crystal.Keywords:diphenylanthracene;polymorph;crystal structure;scintillator;neutron detection
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 11
·3395
·
IF 4.927
Changli Ma,Taisen Zuo,Zehua Han,Yuqing Li,Sabrina Gärtner,Huaican Chen,Wen Yin,Charles C. Han,He Cheng
The atomic picture of cellulose dissolution in alkali/urea aqueous solution is still not clear. To reveal it, we use trehalose as the model molecule and total scattering as the main tool. Three kinds of alkali solution, i.e., LiOH, NaOH and KOH are compared. The most probable all-atom structures of the solution are thus obtained. The hydration shell of trehalose has a layered structure. The smaller alkali ions can penetrate into the glucose rings around oxygen atoms to form the first hydration layer. The larger urea molecules interact with hydroxide groups to form complexations. Then, the electronegative complexation can form the second hydration layer around alkali ions via electrostatic interaction. Therefore, the solubility of alkali aqueous solution for cellulose decreases with the alkali cation radius, i.e., LiOH > NaOH > KOH. Our findings are helpful for designing better green solvents for cellulose.Keywords:neutron total scattering;cellulose;dissolution mechanism;layered structure;complexation
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MEDICAL ONCOLOGY
·
2024
·Vol. 41
·期 5
·1-5
·
IF 2.8
Chen Jiejian,Li Yonghao,Gan Xiaoning,Weng Chengyin,Fang Xisheng,Liu Guolong
It has been proposed that boron neutron capture therapy (BNCT) holds promise as a treatment modality for melanoma. However, the effectiveness of boron agents in delivery remains a critical issue to be addressed for BNCT. To this end, phenylboronic acid, which exhibits good water solubility and low cytotoxicity similar to BPA, has been investigated as a potential nuclear-targeting boron agent. The boron concentration of phenylboronic acid was found to be 74.47 ± 12.17 ng/10 6 B16F10 cells and 45.77 ± 5.64 ng/10 6 cells in the nuclei. Molecular docking experiments were conducted to investigate the binding of phenylboronic acid to importin proteins involved in nuclear transport. The potential of phenylboronic acid to serve as a desirable nucleus-delivery boron agent for neutron capture therapy in melanoma warrants further exploration.
研究领域:
肿瘤学
·
药理学
·
核医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
·
2024
·
IF 1.9
Wanting Gui,Lu Yao,Xunsheng Zhou,Qi Wu,Chao Li,Shi Zhang,Yunfeng Zhan,Cai Lin Wang
Ag-based metal halide scintillators have recently attracted significant interest for X-ray imaging due to their high light yield and ultra-fast decay lifetime. These properties are advantageous for thermal neutron detection, yet their application in this area have not been thoroughly explored. In this article, we investigate the properties of Cu-doped Cs
2
AgI
3
metal halide scintillators for X-ray imaging and thermal neutron detection. A simple synthesis process was employed to produce Cu-doped Cs
2
AgI
3
scintillators. The as-prepared Cu-doped Cs
2
AgI
3
exhibited intense green emission with a photoluminescence quantum yield (PLQY) of 55 ± 2.7%. Cu-doped Cs
2
AgI
3
/PVDF plastic scintillation screen has been prepared and achieved a resolution of 5 lp/mm under X-ray radiation. A composite consisting of
6
LiF, Cu-doped Cs
2
AgI
3
, and Poly (methyl methacrylate) (PMMA) was utilized for thermal neutron detection, achieving a light yield of about 12,526±9 photons/thermal neutron, which is almost twice that of a commercial
6
Li-glass (GS20) scintillator (7000 photons/thermal neutron). Effective neutron-gamma pulse discrimination was achieved using a network dynamics digital filter, effectively separating thermal neutron events from gamma events.
研究领域:
材料科学
·
核技术应用
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 24
·2100969
·
IF 18.808
Juan Li,Jianglong Kong,Sihan Ma,Jiacheng Li,Meiru Mao,Kui Chen,Ziteng Chen,Jiaxin Zhang,Yanan Chang,Hui Yuan,Tong Liu,Zizhu Zhang,Gengmei Xing
Novel boron-containing carbon dots (BCDs) are designed and prepared for boron neutron capture therapy (BNCT) with superior water solubility and excellent optical property for tracking 10 B in vitro and in vivo. Encapsulation of BCDs using exosomes (Exos) from macrophages yields BCD–Exos of ≈100 nm. Fluorescent imaging shows that the BCD–Exos are internalized and distributed around the nuclei of U-87-MG glioma cells. BCD–Exos are also verified to cross the blood–brain barrier and significant accumulation in tumor tissue of the orthotopic U-87-MG glioma tumor-bearing mice model 4 h after administration. Using inductively coupled plasma mass spectrometry (ICP-MS), it is detected that 10 B in tumor tissue is 107.07 ± 1.58 ppm, and T/N ratios are enhanced from 2.03 ± 0.08 of boron phenylalanine (BPA) to 5.28 ± 0.29 of the BCD–Exos. In BNCT, the neutron radiation dose is 8.40 ± 0.12 Gy when a 500 mg kg −1 10 B dosage is given. Finally, there is a prominent BNCT effect of the BCD–Exos-treated brain glioma in the mice model, and the survival ratio is 100% at the end of the experiment. The excellent curative effect of BNCT using BCD–Exos to brain glioma is achieved through adjusted biodistribution of boron in the cancer cell, enhanced T/N ratios, and the precise match between boron and neutron exposure in the site of the tumor in vivo with fluorescence imaging of BCD–Exos.
研究领域:
肿瘤学
·
放射治疗
·
纳米医学
·
神经科学
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Materials and Energy
·
2020
·
IF 2.213
Xinyi Yang,Liangliang Song,Bo Chang,Qi Yang,Xiaodong Mao,Qunying Huang
The low solubility of gadolinium (Gd) limits its application in iron-based neutron shielding alloys. In this study, a high content of Gd up to 7.87 wt.% was added into 316L stainless steel by mechanical alloying (MA) of Gd 2 O 3 with 316L powder. Neutronics calculation results showed that the shielding efficiency of 0.2 mm thick 7.87 wt.% Gd-316L alloy was equivalent to that of 33 mm thick 316L for thermal neutrons. Microstructure analysis indicated that Gd-Si-O particles with an average size of 12.5 nm were uniformly dispersed in the matrix. It revealed that Gd 2 O 3 dissolved into the 316L matrix during MA and re-precipitated at around 780 °C as Gd 2 SiO 5 by XRD and TG-DSC. This study provides a novel Gd-containing alloy designed to achieve integration of structural alloys with good neutron shielding function for future application.
研究领域:
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）