用PIXE分析方法研究克山病区儿童红血球中铷的含量

用质子激发X荧光(PIXE)分析方法研究了儿童红血球中微量元素铷的含量与克山病的关系。测量结果表明,在克山病流行及硒水平低的德昌县儿童红血球中铷的含量约是低硒正常区、多年补硒的老病区及正常硒水平的对照区的三倍。后三个地区之间无明显差别。从有关铷的生理作用和测量结果说明元素铷可能是与克山病有关和值得研究的另一个元素。     

A STUDY OF ANTINODULARIZING PROPERTIES OF Pb, Bi, Al AND Ti IN NODULAR CAST IRON BY SPM

The nodular cast iron samples were prepared with the normal nodularizing process, in which the important antinodularizing elements Pb, Bi and Al were added respectively in order to research the influence of them on the nodularization of the graphites. The nodular graphites were extracted from the nodular cast iron by the electrolytic technique. The distribution of trace elements in nodular and deformed graphite were measured by Scanning Proton Microprobe (SPM). Most of the adding elements Pb, Bi and Al existed in matrix as impurities, a part of them intruded into the nodular graphites. A new suggestion of Ti antinodularizing properties had been proposed. The influence of Pb, Bi and Al on the nodularization was indirectly performed through Ti. Therefore, Ti is one of the most important antinodularizing elements.     

PIXE ANALYSIS OF GRAPHITE PHASE IN NODULAR CAST IRON

The graphite phase has been extracted from the nodular cast iron to measure the concentration of trace element in it. The impurity phase was removed from the extracted matter by dissolving it with HCl and HCl+H_2O_2 to get the pure graphite phase. PIXE measurements were performed with thick targets of the pure graphite phase. Differences in the trace element concentrations between the graphite phase and the matrix have been observed. The effect of Ti and As in graphite phase on the nodularization rate and the mechanical properties have been studied.     

再论不破坏中子活化分析中的若干问题

1.重峰与本身的干扰问题 文献[1]中提到实验测定了四十种元素和根据文献数据计算了十二种元素由(n,γ)反应各自产生的放射性核素(包括其子体)所发射的诸γ在一定测量条件下的光峰的相对计数率。对~(235)U和~(232)Th的裂片也作了相应的处理。 按γ能量由低到高的次序排列成表。表中列出:(1)γ能量;(2)放射性核素,它发射γ能量;(3)稳定同位素及其丰度,它产生放射性核素;(4)核反应和截面并包括裂变截面与产额;(5)自身、母体与子体的半衰期;(6)文献     

广州大气飘尘PIXE初步研究

本工作初步报导了广州地区五个典型点冬季大气飘尘成份和浓度,计算了富集因子和相关系数,研究了广州大气飘尘的特征,并简单地讨论了大气飘尘的粒度分布规律。     

THE METABOLISM OF TITANIUM AND OTHER ELEMENTS IN WISTER RATS

The concentrations of Ti and Ca, P, K, Fe, Cu and Zn in blood samples were determined by PIXE after a single intravenous and a single oral dosing with titanium- ascorbate (Ti- Vc) in Wister rats. Following the intravenous injection with 50 mg Ti- Vc/kg body weight, the absorption, distribution and clearance in blood could be described by an exponential equation of three terms. After gavaged with 500 mg Ti-Vc/kg body weight, at 1.5 h the content of Ti reached the highest level. The concentration of Ca was increasing, with the absorption, distribution and clearance of Ti in blood. The contents of Fe and K were decreasing. And the contents of Cu and Zn were significantly fluctuating. The effect of Ti on animal growth could be explained by the fact that Ti- Vc supplementation could promote the absorption of Ca.     

石英晶体谐振频率与其微量附着质量的关系

一、引言利用石英晶体的压电效应可以制成晶体振荡器。石英晶片(以下简称晶片)的谐振频率受晶片上附着(或去掉)质量的影响最灵敏的振动模式是高频厚度切变振动模式。厚度切变振动晶片的谐振频率由其频率方程决定。用压电石英谐振子定量测量     

TRACE ELEMENTAL ANALYSIS OF RAT CATARACTOUS LENSES BY PIXE

Cataracts were observed in the eye lenses of a group of Wistar rats that had been injected with Na2SeO3. The trace elemental analysis of their lenses was carried out by PIXE. The results showed that the variations of elemental contents were different between the injected rats and the controls. The elemental concentrations, which exhibited a certain regularity in their variations,could be related to the time of formation of cataract and to its state.