共查询到19条相似文献,搜索用时 125 毫秒
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在放射性同位素生产和中子活化分析中,快中子注量率对放射性同位素产额估算起着非常重要的作用。为测量堆中高能中子(〉6MeV)的成分,本工作利用核反应238U(n,2n)237U来进行监测。 相似文献
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用于快中子引起带电粒子核反应研究的屏栅电离室及双参数测量系统 总被引:2,自引:2,他引:2
本文主要介绍和描写了用于快中子引起的发射带电粒子核反应研究的具有共阴极的两个背靠背的双重屏栅电离室。用双参数数据获取系统可同时得到阳极和阴极的关联信号。由此可以研究由贴在阴极上的靶物质发射的带电粒子的能量和角分布,实验上用Puα放射源来检验屏栅电离室的基本性能,由双参数数据获取系统得到其双维谱,经数据处理之后,其角分布基本上呈现各向同性分布,对Puα放射源的能量(E=5.499MeV),其能量分辨串为~2%,此电离室已用于(40) ̄Ca(n,α)和 ̄(64)Zn(n,α)等核反应研究工作。 相似文献
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利用飞行时间谱直接测量了低能正电子与表面相互作用时的真空Ps产额.该方法比通常的峰法和峰-谷法准确、简单:利用该方法研究了Ar+溅射在Si(100)面上诱导的缺陷损伤及退火行为。 相似文献
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本文介绍多元分层动态靶溅射的快速Monte Carla模拟程序的计算过程、程序框图以及应用实例。本程序采用二体碰撞近似描述原子间的散射过程,所用作用势为Molière近似的Thomas-Fermi势。在相同计算精度下,该程序的计算时间约为原程序的一半。该程序可用于计算几百eVkeV离子轰击多元无定型靶的溅射产额,给出溅射能谱、角分布及深度来源分布等计算结果。 相似文献
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The principle of magnetron sputtering is introduced andthe balanced and unbalanced magnetrons are compared andthe necessity of unbalanced magnetrons is explained as well. Several recent developments in plasma magnetron sputtering, i.e., unbalanced magnetron sputtering, pulsed magnetron sputtering and ion assisted sputtering, are discussed. The recent developments of unbalanced magnetron systems and their incorporation with ion sources result in an understanding in growingimportance of the magnetron sputtering technology, which makes the technology an applicable deposition process for a variety of important films, such as wear-resistant films and decorative films. 相似文献
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本文报道了27keV Ar~+离子分别轰击Cu元素靶和CuAu合金靶时溅射Cu原子的同位素(~(63)Cu和~(65)Cu)分馏测量结果,发现:(1)对Cu元素靶,同位素分馏δ_f(~(63)Cu,~(65)Cu)=(62±27)‰,而对Cu-Au合金靶,δ_f=(5.9±1.6)‰;(2)δ_f(~(63)Cu,~(65)Cu)随发射角θ的变化对两者靶而言趋势是相似的,但在CuAu合金靶情况下,当θ≤40°时,δ_f((63)Cu,~(65)Cu)为负值。 相似文献
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Satoshi Ninomiya Chikage Imada Masafumi Nagai Yoshihiko Nakata Takaaki Aoki Jiro Matsuo Nobutsugu Imanishi 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2005,230(1-4):483-488
Total sputtering yields have been measured for SiO2 and Cu targets bombarded with Si ions at an incident energy between 500 keV and 5.0 MeV using a quartz crystal microbalance technique. In order to measure total yields accurately, we have developed a beam modulation technique to avoid the effect of thermal drift. In the MeV energy range, an ion penetrates through thin SiO2 and Cu targets and is implanted into a quartz crystal. Therefore, the thickness of these layers deposited on quartz crystals was carefully controlled to avoid damage of quartz crystal by incident ions. As a result, total sputtering yields of SiO2 increased with incident Si ion energy, while those of the Cu target decreased. The total yields of the SiO2 target were represented well by a power low of the electronic stopping power. 相似文献
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《核技术(英文版)》1999,10(1):15
The zirconia containing
12wt%Y2O3 thin films deposited by r.f. magnetron sputtering at 25℃
or 400℃, and then bombarded with Ar+ beam at room temperature were
characterized with XRD before and after Ar+ bombardment. It is found that a
series of phases formation and transformation happened, among them the mostimportant event
is that T' phase appeared after Ar+ irradiation andthe content of the T' phase
increased with the increase of Ar+ iondoses from 5×1015 to 6×1016
ions cm-2. 相似文献
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高剂量注入中离子溅射的影响 总被引:1,自引:0,他引:1
在离子注入材料改性的研究过程中(金属、绝缘材料和光学材料等),在许多场合下,要求注入的元素(如Fe中注入N、Y、Ph和Sn等)在靶子中占百分之几的含量,这就要求注入剂量高达10~(17)/cm~2到10~(12)/cm~2。由于离子注入的溅射效应在低能和大剂量注入中是相当明显的,因此,对这些元素高剂量注入后的杂质分布、溅射系数、溅射厚度和靶子中杂质的收集量做一分析是十分重要的。 相似文献
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