共查询到20条相似文献,搜索用时 94 毫秒
1.
2.
可以把真空弧产生的金属等离子体用作常规金属离子植入用的离子源中离子的原材料,或可用作等离子体浸泡离子植入的浸泡等离子体。在两种情况下,产生等离子体的基本方法是一样的;方法是简单折、有效的,并可与各种金属一起使用。不同种类的真空弧离子源由本文作者及其他人研制出来,它们作为金属离子植入工具的适用性已为人们公认。金属等离子体浸泡表面处理是一种刚出现的方法,它的性能和应用是本研究的课题。不论在所使用的工序 相似文献
3.
空气中所含气态放射性物质的测量,在一般剂量测量中常用充以待测气体的电离室来进行。如复估计此种装置对不同能量的β放射性气体的灵敏度或刻度常数,可以利用下面的简单公式及曲线图。 相似文献
5.
6.
7.
9.
10.
核爆炸的核监测技术的发展 总被引:1,自引:0,他引:1
毛用泽 《核电子学与探测技术》1990,10(5):301-307,F004
本文阐述了核电子学与核探测技术学科中的一个重要专业分支——核爆炸的核监测技术的内涵和范围,介绍并分析了核爆监测及核辐射监测的技术要求特点和发展现状。 相似文献
11.
本文用间歇平衡实验和柱迁移实验研究了放射性~(131)I~-和~(131)IO_3~-在花岗岩-1(浙江)、花岗岩-2(江苏)、紫色页岩(江苏)、凝灰岩(江苏)等4种地质材料中的吸附和迁移行为,并测定了它们的吸附比。结果表明,四种岩石样品对~(131)I~-和~(131)IO_3~-基本上不吸附或仅有微小的吸附,间歇平衡实验与柱迁移实验所得结果除紫色页岩相差稍大外,其它基本是一致的。 相似文献
12.
13.
14.
亚铁氰化钾钛吸附Cs^+的机理研究 总被引:1,自引:0,他引:1
研究了亚铁氰化钾钛在模拟酸性高放废液中吸附Cs+的行为。实验研究了温度、粒度、振荡频率、Cs+浓度等因素对Cs+吸附速度的影响,测定了吸附过程中亚铁氰化钾钛组分随所吸附的Cs+量的变化。与亚铁氰化钾钛在CsNO3溶液中吸附Cs+的行为相比较可知,亚铁氰化钾钛对Cs+的吸附主要是粒扩散和膜扩散混合控制,是亚铁氰化钾钛中的K+与溶液中的Cs+进行了交换。 相似文献
15.
16.
《Journal of Nuclear Science and Technology》2013,50(4):641-648
The influence of pH and ionic strength on the sorption of Cs by quartz, biotite, and microcline was investigated to understand the Cs sorption process onto the granite host rock. Cesium sorption by each mineral increased with increasing pH, and reached a constant value at high pH. The Cs sorption decreased in the presence of sodium perchlorate as a matrix ion, and the apparent Kd decreased with an increasing initial concentration of Cs. In the analysis, a two-site model either giving or not giving consideration to the presence of the triple layer was applied to the results of each mineral, and the model parameters were determined. By taking the obtained parameters, the model was used to predict the distribution coefficient Kd of cesium on granite. The simulated Kd values were discussed by comparing themselves with the reference ones for granite. 相似文献
17.
本文研究了在模拟地下水介质中花岗岩对硒的吸附、解吸规律。实验结果表明,在本实验条件下花岗岩对硒的吸附和解吸均服从 Freundlich 吸附等温方程;在还原剂(Fe 粉和腐植酸)存在下,花岗岩对硒的吸附量有所增大;在 pH 为4左右硒吸附量最大;硒吸附量还随花岗岩粒径减小即比表面积增大而增大,说明吸附主要发生在固相表面。 相似文献
18.
19.
《Journal of Nuclear Science and Technology》2013,50(12):1184-1193
Sorption experiments of 60Co, 85Sr and 137Cs were carried out to study sorption characteristics onto a porous tuff. Sorption kinetics and rate controlling step were examined. The effects of particle size on sorption and distribution ratio were also investigated. Desorption experiments were carried out by using extracting reagents to distinguish sorption mechanisms such as reversible sorption in groundwater condition, ion exchange, association with ferro-manganese oxides or oxyhydroxides, and irreversible fixation. Strontium sorbed onto the tuff surface mainly by the ion exchange reaction which was fast and reversible. Cobalt and cesium do not sorb by simple step. The main sorptive binding of cobalt was the association with ferro-manganese oxides and the secondary one was the irreversible fixation. Diffusion into the lattice of rock minerals controlled the sorption rate of cobalt. The main sorption of cesium was the irreversible fixation, secondary one was the ion exchange. 相似文献