| 循环活化和缓发中子计数法测痕量铀的改进:多晶和单晶硅铀含量的测定 |
| |
| 引用本文： | 宋全埙.循环活化和缓发中子计数法测痕量铀的改进:多晶和单晶硅铀含量的测定[J].核技术,1987(10). |
| |
| 作者姓名： | 宋全埙 |
| |
| 作者单位： | 中国原子能科学研究院 |
| |
| 摘 要： | 我院改进前的缓发中子测铀装置10次循环活化分析的探测极限为5ppb左右,这对植物、牧草、粮食等样品的分析是有效的,然而对高纯物质的分析(如单晶硅中的铀的分析)就不够了。据国外报道大规模集成电路存贮器的单晶硅片要用高纯的单晶硅,否则会出现软错误。其原因是单晶硅片中的~(238)在天然衰变时会释放出几个MeV能量的α粒子,它破坏了存贮器里的讯息。高纯单晶硅的钠含量比普通单晶硅(ppb级)低2—3个数量级。为了能测定高纯物质中的铀含量,对测量装置和方法作了一些改进,使灵敏度提高了约一个数量级。
|
| 关 键 词： | 缓发中子 循环活化分析 单晶硅 痕量铀 |
The improvement in the determination of trace uranium byrepeating activation and delayed neutron counting: The determination of the uranium content of mukicrystalline and monocrystalline silicon samples |
| |
| Song Quanxun.The improvement in the determination of trace uranium byrepeating activation and delayed neutron counting: The determination of the uranium content of mukicrystalline and monocrystalline silicon samples[J].Nuclear Techniques,1987(10). |
| |
| Authors: | Song Quanxun |
| |
| Affiliation: | Institute of Atomic Energy of China |
| |
| Abstract: | The improvements are as follows: increasing the efficiency of the detector to 11%; reducing the delay time; using the best cyclic activation analysis condition; reducing the background and increasing the weight of the sample. Now the detection limit is about 0.7 ppb. We have determined the uranium contents of one multicrystalline and five monocrys-talline samples made in China. The uranium contents of the multicrystalline and two mo-nocrystallines can be determined and the other three's are lower than the detection limit. This paper also describes the methods of determination of the best cyclic activation analysis condition and cyclic amplifier factor by a computer. |
| |
| Keywords: | delayed neutron repeating activation analysis monocrystalline trace uranium analysis |
| 本文献已被 CNKI 等数据库收录！ |
