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Low melting point MCP-69, MCP-96, MCP-137, and MCP-200 alloys for radiation protection in radiological and therapeutic processes

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Radiation Medicine and Protection 2022年第4期3卷 175-182页

作者： Michael W.Perrigin kendall a.williams Brandon K.Wright Malaika Maqbool Emily Caffrey Remo George Ghafar Ali Muhammad Maqbool Health Physics Program Department of Clinical&Diagnostic SciencesThe University of Alabama at BirminghamBirminghamAL 35294USA Nuclear Medicine and Molecular Imaging Sciences Program Department of Clinical&Diagnostic SciencesThe University of Alabama at BirminghamBirminghamAL 35294USA iomedical Sciences Program Department of Clinical&Diagnostic SciencesThe University of Alabama at BirminghamBirminghamAL 35294USA Nanomaterials Research Group Physics DivisionPINSTECHIslamabadPakistan

Objective To evaluate the low melting-point MCP-69,MCP-96,MCP-137,and MCP-200 alloys,and characterize them for their potential to protect from the harms associated with radiation and eliminate radiation hazards during radiological procedures and treatment of *** The Klein-Nishina formula was used to calculate the electronic and atomic cross-sections of these alloys using photon beams with energies 4,6,9,12,and 18*** transfer coefficients,Compton mass attenuation coefficient,mass-energy transfer coefficient,and recoil energy of electrons in the specific photon energies of 4–18MeV were *** alloys'effective charge number and the photon energy were key factors in determining the properties found by utilizing the Klein-Nishina formula and Compton *** The cross sections and energy transfer coefficients increased with the increasing effective charge number Z of the alloys and decreased as the photon energy *** Compton recoil of the ejected electrons was observed to have a direct relationship with photon energy,but mass-energy transfer decreased with increasing photon *** alloys can replace the toxic lead for environmentally cleaned radiation *** These calculations and characteristics of the MCP alloys can help further determine their viability as materials for radiation shielding,their use in safe cancer diagnosis,treatment,and environmental hazards protection.

关键词： MCP alloys Klein-Nishina formula Cross-sections Radiation shielding Safe cancer diagnosis and treatment

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Influence of interparticle interactions on the kinetics of self-assembly and mechanical strength of nanoparticulate aggregates

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Particuology 2009年第2期7卷 106-113页

作者： Roberto Moreno-Atanasio Simon J.Antony Richard a.williams Institute of Particle Science and Engineering University of LeedsLeedsLS2 9JTUnited Kingdom

Computer simulations based on Discrete Element Method have been performed in order to investigate the influence of interparticle interactions on the kinetics of self-assembly and the mechanical strength of nanoparticle aggregates. Three different systems have been considered. In the first system the interaction between particles has been simulated using the JKR （Johnson, kendall and Roberts） contact theory, while in the second and third systems the interaction between particles has been simulated using van der Waals and electrostatic forces respectively. In order to compare the mechanical behaviour of the three systems, the magnitude of the maximum attractive force between particles has been kept the same in all cases. However, the relationship between force and separation distance differs from case to case and thus, the range of the interparticle force. The results clearly indicate that as the range of the interparticle force increases, the self-assembly process is faster and the work required to produce the mechanical failure of the assemblies increases by more than one order of magnitude.

关键词： Nanoparticles Discrete Element Method (DEM) Self-assembly JKR model van der Waals force

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胆管癌与慢性溃疡性结肠炎的联系

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海军军医大学学报 1982年第2期 164-164页

作者： williams SM ,姚德荣

溃疡性结肠炎病人可发生各种肝病,而发生胆管癌则少见。Parker和kendall于1954年首先报道溃疡性结肠炎与胆管癌的联系,此后至少有67例的报道(本文报告一例)。此二种病在一般人群中均较少见,偶然同时发生在同一病人的机会是极小的。一般人群

关键词：胆管癌慢性溃疡性结肠炎溃疡性结肠炎病

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