同量异位素

在加速器质谱（AcceleratorMassSpectrometry，简称AMS）测量中，同量异位素的鉴别具有十分重要的意义。

Isobaric identification is very important in accelerator mass spectrometry measurement .

△E-E望远镜方法对同量异位素的分辨本领取决于△E和E探测器的能量分辨本领和离子所带能量的高低。

The energy loss method is depended on the resolution of the detector and the ion energy .

第二部分AMS测量中同量异位素的鉴别方法；

Second , the isobaric identification methods in AMS measurement .

一台用于AMS的鉴别同量异位素的气体电离室

A gas ionization chamber for indentification of isobars in AMS

AMS测量中同量异位素的鉴别方法

Methods of Isobaric Identification in AMS Measurements

为了更好地测量较重核素，实现同量异位素的鉴别，本论文工作开展了AMS专用Bragg探测器研制工作。

In order to measure heavy ions with better discriminating isobars , A Bragg detector has been set up for AMS in our lab.

为了提高加速器质谱（AMS）测量中同量异位素的分辨能力，设计了一种新型探测器即充气飞行时间探测器。

In order to improve the power of isobaric identification in the accelerator mass spectrometric measurements , a new gas detector called gas-filled time-of-flight spectrometric detector has been set up .

而存在分子离子及同量异位素~（99）Ru的干扰，采用传统的质谱方法也很难实现对它的高灵敏测量。

Due to the existence of the interferent of the stable isobar Ru and molecules ions , the common Mass spectrometry is also difficult to detect the ~ ( 99 ) Tc with high sensitivity .

GF-TOF方法对同量异位素的分辨取决于△E的不同而产生的时间不同，时间分辨仅来源于定时探测器电流脉冲上升时间的快慢和离子在气体介质中的能量离散。

Isobaric identification with GF-TOF method is based on the different time of flight caused by the different energy loss . The resolution of GF-TOF is mainly affected by two factors . First , the rises time of current pulse from start and stop detector .

主要介绍了加速器质谱测量中同量异位素的几种鉴别、排除方法，以及这些方法的原理、发展及应用。

Several methods of isobaric identification in AMS measurements are discussed in this paper . Principles , developments and applications of these methods are also introduced .

质量分布和同量异位素分布与推广的统计模型和蒙特卡罗方法计算结果满意地相符。

The mass yield distribution and the isobaric yield distribution are in good agreement with those calculated from a modified statistical model and corresponding Monte Carlo technique .

对样品形态选择、离子转换效率、离子传输效率和离子接收效率进行研究，消除了浓缩同位素测量时强峰拖尾对弱峰的干扰及同量异位素干扰。

The ionization efficiency of the samarium , as well as the ion transmission efficiency and the receive efficiency were researched . The interference of the tail peak that coming from the strong peak was eliminated and the isobars of Sm was not found .