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当前核素迁移研究的若干进展 总被引:30,自引:12,他引:18
刘元方 《核化学与放射化学》1990,12(1):1-8
本文着重评述了当前有关放射性废物地质处置的核素迁移研究的进展,并讨论了重要核素、迁移化学、天然类比体系、有机化合物和微生物对核素迁移的影响。 相似文献
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裂片核素在岩石中的迁称研究:V.核素 ^125I在大理石的扩散与渗透 总被引:1,自引:0,他引:1
研究了核素^125I(模拟裂片核素^129I)在大理石中的扩散与渗透行为,测定了一系列扩散与渗透参数。实验结果表明,核素在大理石中的传质速率大于花岗岩的,根据提出的核素在岩石中的迁移模型,计算了^125I在大理石中的迁移分布曲线,由于^125I在大理石中的迁移速度快,因此核废物库址不宜选在大理石岩层中。 相似文献
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研究了核素~(125)I(模拟裂片核素~(129)I)在大理石中的扩散与渗透行为,测定了一系列扩散与渗透参数。实验结果表明,核素在大理石中的传质速率大于花岗岩的。根据提出的核素在岩石中的迁移模型,计算了~(125)I在大理石中的迁移分布曲线。由于~(125)I在大理石中的迁移速度快,因此核废物库址不宜选在大理石岩层中。 相似文献
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高放废物处置评价中应用的有关程序 总被引:1,自引:0,他引:1
对有关在高放废物处置中应用的程序进行了调研,根据应用方向将这程序分成源顶计算程序、地下水与核素迁移程序、热-湿-力耦合程序及其它程序4类。 相似文献
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澳大利亚原子能委员会实施一项旨在测定与铀矿体伴生的20—30个天然放射性核素中某几个的迁移计划。工作意图之一在于使我们自己的实验室及国外的放射性废物管理规划所提出的地质迁移模式得到证实。虽然天然放射性核素谱中并不恰巧包含着放射性废物中感兴趣的那些元素 相似文献
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《Journal of Nuclear Science and Technology》2013,50(5):371-376
Absorption rates of dilute iodine vapor contained in air by aqueous mixtures of sodium hydroxide and boric acid were measured using a laminar liquid jet column absorber at 298 K. Absorption rates in this system are controlled by a series of complex reactions taking place in the liquid phase. The reaction rate constant of iodine hydrolysis in the aqueous phase was determined from the absorption rates observed under the conditions that the base-catalytic hydrolysis reaction of iodine can be considered to be irreversible and that other reactions can be neglected. The absorption rates calculated theoretically with the rate constant value obtained above were in good accordance with the whole experimental data observed for a wide range of experimental conditions. 相似文献
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在市场化大趋势的推动下,核电项目的成本管理意识空前强化。在众多成本管理的影响因素中,工程量是决定性因素。本文从概念区分的角度划分了核电项目实施过程的活动层次,进行了相应分析,找出了各个层次活动量的不同测量方式,通过对这些方式的本质解析和整合,既澄清了施工项目工程量概念本身,也澄清了一些模糊认识,为工程量的管理和成本管理的改进奠定了必要的基础。 相似文献
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Yuki Edao Katsumi Sato Yasunori Iwai Takumi Hayashi 《Journal of Nuclear Science and Technology》2016,53(11):1831-1838
Detritiation system of a nuclear fusion plant is mandatory to be designed and qualified taking carefully into consideration all the possible extraordinary situations in addition to that in a normal condition. We focused on the change in the efficiency of tritium oxidation of a catalytic reactor in an event of fire where the air accompanied with hydrocarbons, water vapor, and tritium is fed into a catalytic reactor at the same time. Our test results on the effect of these gases on the efficiency of tritium oxidation of the catalytic reactor indicated; (1) tritiated hydrocarbon produces significantly by reaction between tritium and hydrocarbons in a catalytic reactor; (2) there is little possibility of degradation in the detritiation performance because the tritiated hydrocarbons produced in the catalyst reactor are combusted; (3) there is no possibility of uncontrollable rise in the temperature of the catalytic reactor by heat of reactions; and (4) saturated water vapor could temporarily poison the catalyst and degrades the detritiation performance. Our investigation indicated a saturated water vapor condition without hydrocarbons would be the dominant scenario to determine the amount of catalyst for the design of catalytic reactor of the detritiation system. 相似文献
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空气中氚的存在形态主要是氚化水蒸气(HTO)、氚气(HT)和氚化甲烷(CH3T)。空气中的氚含量很低,测定通常采用累积取样和液闪谱仪测量相结合的方法。本文综述了空气中不同形态氚的取样方法的研究进展,对不同取样方法进行了比较分析,总结了不同取样方法存在的问题和不足,为空气中氚的取样方法研究提供参考。 相似文献
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D. Liljequist 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(24):3546-3553
The effect of inelastic events on the elastic scattering of particles in a scattering medium may be described in terms of inelastic absorption (depletion of the elastic scattering channel), which may be implemented either by means of a complex phaseshift or by means of an optical potential. Using both methods, inelastic absorption is introduced in the exact quantum calculation of multiple elastic s-wave scattering of a particle in a cluster of point scatterers. The average solution of the quantum calculation for a large number of simulated clusters with identical boundaries but with scatterers in randomly varying positions is compared with the result of a corresponding trajectory simulation, where an inelastic mean free path has been introduced. In the trajectory simulation an inelastic event results in the absorption of the particle, i.e. termination of the trajectory. It has previously been shown that trajectory simulation of purely elastic scattering is a valid approximation of the average quantum solution if the incident particle wavelength is at most about equal to the average distance between neighbour scatterers. It is found that this condition still holds in the presence of inelastic absorption, although quantum and trajectory calculations of the scattering event distribution inside the cluster give increasingly similar results for decreasing inelastic mean free path. 相似文献
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This paper presents separation results of a mixture of nitrogen, argon and krypton ions in the process of plasma-optical mass separation on the POMS-E-3 separator model. We determined the behavior of the separation with a change in the value of magnetic field induction in the azimuthator and in the degree of compensation of the spatial charge in ion flows. An analysis is performed for experimental data by correlation with the results of a theoretical study and numerical experiments. The objectives of future experiments are outlined. 相似文献
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The Chinese Fusion Engineering Test Reactor (CFETR) represents the next generation of full superconducting fusion reactors in China.Recently,CFETR was redesigned with a larger size and will be operated in two phases.To reduce the heat flux on the target plate,a snowflake (SF) divertor configuration is proposed.In this paper we show that by adding two dedicated poloidal field (PF) coils,the SF configuration can be achieved in both phases.The equilibria were calculated by TEQ code for a range of self-inductances li3.The coil currents were calculated at some fiducial points in the flattop phase.The results indicate that the PF coil system has the ability to maintain a long flattop phase in 7.5 and 10 MA inductive scenarios for the single null divertor (SND) and SF divertor configurations.The properties of the SF configuration were also analyzed.The connection length and flux expansion of the SF divertor were both increased significantly over the SND. 相似文献
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金属氚化物中氦行为的研究现状与发展趋势 总被引:1,自引:1,他引:0
简要概述了近些年来金属氚化物中3He的存在和演化行为、延缓3He从材料中析出的可能途径以及时效对氚化物性能影响等方面的研究进展,重点对几种金属氚化物的3He时效行为进行了比较分析,并对其研究趋势作了概要评述。文章同时简要介绍了本研究组在金属氚化物3He演化行为研究方面的理论模拟和实验研究方面的工作进展。 相似文献