为解决氙(Xe)的九种稳定同位素质量差异大(约9.6%),质谱探测器接收难的问题,利用Helix MC Plus静态气体质谱仪,建立一种测量Xe全部稳定同位素丰度比的高精度质谱分析方法,快速、准确获得Xe的全部稳定同位素丰度。首先对混合气体样品中...为解决氙(Xe)的九种稳定同位素质量差异大(约9.6%),质谱探测器接收难的问题,利用Helix MC Plus静态气体质谱仪,建立一种测量Xe全部稳定同位素丰度比的高精度质谱分析方法,快速、准确获得Xe的全部稳定同位素丰度。首先对混合气体样品中的Xe进行提取分离与纯化等条件实验,减小其他惰性气体及活性组分对Xe同位素分析测量的影响,再使用跳峰和多接收两种方式相结合的测量方法,实现在进样量极小时,基于Helix MC Plus型静态气体质谱仪的Xe全部稳定同位素的高精度测量,并利用天然丰度Xe标准气体对配制的混合气体样品测量结果进行线性校正。结果表明,在进样量约1.12×10^(-12)mol条件下,法拉第杯测量129 Xe/^(132)Xe、^(130)Xe/^(132)Xe、^(131)Xe/^(132)Xe、^(134)Xe/^(132)Xe、^(136)Xe/^(132)Xe丰度比的相对标准偏差≤0.24%,对于使用计数法测量124 Xe/^(132)Xe、126 Xe/^(132)Xe丰度比的相对标准偏差分别为0.22%和0.39%。本方法稳定性好、精度高,可以实现痕量Xe稳定同位素的丰度比质谱分析测试。展开更多
The brief procedure of how to get a gas mixture of low concentration and high accuracy with the double balance weighing method was described. This method requires two balances of both different ranges and high resolut...The brief procedure of how to get a gas mixture of low concentration and high accuracy with the double balance weighing method was described. This method requires two balances of both different ranges and high resolutions, also tow sets of equipment for introducing Ar, Ne, Kr, Xe, and the Nitrogen for balance gas. Two sets of equipment were fulfilled according to the described procedure without any backflow of the component gases. The residual gas in the filling equipment was analyzed to correct the mass of the component gases filled into the mixture gas. By this way, the concentration of Kr and Xe in the preparing mixture gas, is about 0.1%, with the maximum uncertainty of about 0.1%.展开更多
The simulation results of MAT-261 type ion source and ion optics with the SIMION 3D 7.0 software were given. By means of simulation, the ion's trajectory was studied, the cause of low abundance sensitivity was ana...The simulation results of MAT-261 type ion source and ion optics with the SIMION 3D 7.0 software were given. By means of simulation, the ion's trajectory was studied, the cause of low abundance sensitivity was analyzed and the optimal poles' voltage ranges of the ion optics were found. Modifications were made to the LRIMS3000 type mass spectrometer according to result of the simulation. The abundance sensitivity of the mass spectrometer is improved to 2×10-6 from original 5×10-5.展开更多
A Bench top Quadrupole Mass Spectrometer System for Accurate Analysis of Trace Noble Gas was introduced in this paper. The inlet system was a especially designed one. And a capacitance pressure gauge with its linearit...A Bench top Quadrupole Mass Spectrometer System for Accurate Analysis of Trace Noble Gas was introduced in this paper. The inlet system was a especially designed one. And a capacitance pressure gauge with its linearity less than 0.01% was used to measure the fixed volume sample ratio. By using the calibration gas with the uncertainty of which less than 0.1% ,isotope condensed diluent could be quantified online. The procedure is done by alternate online mixture gas measurement of diluent gas, calibration gas to quantify the diluent gas, and diluent gas, sample gas to quantify the sample gas. The precision of six inlet from the same sample is +_0.13%0; The precision of six getting sample from the same source is less than ±0.5%. Self test was done by testing the mixture gas got with weighing method, in which consists Kr and Xe of 30 mg/kg. The system uncertainty tested to be below ±1%.展开更多
In construction of a high current heated hot-tube ion-source, the design of heat shield structure, the optimization of the current input pole and the structure of the heat dissipation are discussed. The heat test of t...In construction of a high current heated hot-tube ion-source, the design of heat shield structure, the optimization of the current input pole and the structure of the heat dissipation are discussed. The heat test of this ion-source is also mentioned and discussed.展开更多
A convenient noble gas purifying equipment based on Zr-Al alloy getters was introduced in this paper. The working conditions of the Zr-Al alloy getters were studied.The supplemental oven was designed, which would heat...A convenient noble gas purifying equipment based on Zr-Al alloy getters was introduced in this paper. The working conditions of the Zr-Al alloy getters were studied.The supplemental oven was designed, which would heat up the Zr-al alloy getters to 1 000℃. Experiments were done on GAM400 bench top Quadrupole mass spectrometer with calibration gas, which consists of Kr and Xe about 0.1%. A spectrum of air after purification was given as an applying example.展开更多
文摘为解决氙(Xe)的九种稳定同位素质量差异大(约9.6%),质谱探测器接收难的问题,利用Helix MC Plus静态气体质谱仪,建立一种测量Xe全部稳定同位素丰度比的高精度质谱分析方法,快速、准确获得Xe的全部稳定同位素丰度。首先对混合气体样品中的Xe进行提取分离与纯化等条件实验,减小其他惰性气体及活性组分对Xe同位素分析测量的影响,再使用跳峰和多接收两种方式相结合的测量方法,实现在进样量极小时,基于Helix MC Plus型静态气体质谱仪的Xe全部稳定同位素的高精度测量,并利用天然丰度Xe标准气体对配制的混合气体样品测量结果进行线性校正。结果表明,在进样量约1.12×10^(-12)mol条件下,法拉第杯测量129 Xe/^(132)Xe、^(130)Xe/^(132)Xe、^(131)Xe/^(132)Xe、^(134)Xe/^(132)Xe、^(136)Xe/^(132)Xe丰度比的相对标准偏差≤0.24%,对于使用计数法测量124 Xe/^(132)Xe、126 Xe/^(132)Xe丰度比的相对标准偏差分别为0.22%和0.39%。本方法稳定性好、精度高,可以实现痕量Xe稳定同位素的丰度比质谱分析测试。
文摘The brief procedure of how to get a gas mixture of low concentration and high accuracy with the double balance weighing method was described. This method requires two balances of both different ranges and high resolutions, also tow sets of equipment for introducing Ar, Ne, Kr, Xe, and the Nitrogen for balance gas. Two sets of equipment were fulfilled according to the described procedure without any backflow of the component gases. The residual gas in the filling equipment was analyzed to correct the mass of the component gases filled into the mixture gas. By this way, the concentration of Kr and Xe in the preparing mixture gas, is about 0.1%, with the maximum uncertainty of about 0.1%.
文摘The simulation results of MAT-261 type ion source and ion optics with the SIMION 3D 7.0 software were given. By means of simulation, the ion's trajectory was studied, the cause of low abundance sensitivity was analyzed and the optimal poles' voltage ranges of the ion optics were found. Modifications were made to the LRIMS3000 type mass spectrometer according to result of the simulation. The abundance sensitivity of the mass spectrometer is improved to 2×10-6 from original 5×10-5.
文摘A Bench top Quadrupole Mass Spectrometer System for Accurate Analysis of Trace Noble Gas was introduced in this paper. The inlet system was a especially designed one. And a capacitance pressure gauge with its linearity less than 0.01% was used to measure the fixed volume sample ratio. By using the calibration gas with the uncertainty of which less than 0.1% ,isotope condensed diluent could be quantified online. The procedure is done by alternate online mixture gas measurement of diluent gas, calibration gas to quantify the diluent gas, and diluent gas, sample gas to quantify the sample gas. The precision of six inlet from the same sample is +_0.13%0; The precision of six getting sample from the same source is less than ±0.5%. Self test was done by testing the mixture gas got with weighing method, in which consists Kr and Xe of 30 mg/kg. The system uncertainty tested to be below ±1%.
文摘In construction of a high current heated hot-tube ion-source, the design of heat shield structure, the optimization of the current input pole and the structure of the heat dissipation are discussed. The heat test of this ion-source is also mentioned and discussed.
文摘A convenient noble gas purifying equipment based on Zr-Al alloy getters was introduced in this paper. The working conditions of the Zr-Al alloy getters were studied.The supplemental oven was designed, which would heat up the Zr-al alloy getters to 1 000℃. Experiments were done on GAM400 bench top Quadrupole mass spectrometer with calibration gas, which consists of Kr and Xe about 0.1%. A spectrum of air after purification was given as an applying example.
