Effects of the atomic level shift in the Auger neutralization rates of noble metal surfaces [0.03%]
原子级台阶对贵金属表面Auger中和率的影响
R C Monreal,D Goebl,D Primetzhofer et al.
R C Monreal et al.
In this work we compare characteristics of Auger neutralization of [Formula: see text] ions at noble metal and free-electron metal surfaces. For noble metals, we find that the position of the energy level of He with respect to the Fermi lev...
Design of a secondary ionization target for direct production of a C- beam from CO2 pulses for online AMS [0.03%]
一种次级离子化靶的设计方案，可直接从CO2脉冲中产生C-反粒子束以进行在线AMS分析
Gary Salazar,Ted Ognibene
Gary Salazar
We designed and optimized a novel device "target" that directs a CO2 gas pulse onto a Ti surface where a Cs+ beam generates C- from the CO2. This secondary ionization target enables an accelerator mass spectrometer to ionize pulses of CO2 i...
Zhiyan Xiao,Rachael Hansel,Lei Zhang et al.
Zhiyan Xiao et al.
The goal of this work is to understand the physical mechanism behind the signal stabilization process in KCl:Eu2+, a storage phosphor material that has generated renewed interest due to its potential in radiation therapy dosimetry applicati...
Rachael A Hansel,Zhiyan Xiao,Lei Zhang et al.
Rachael A Hansel et al.
The effects of high cumulative radiation dose on the luminescence properties of KCl:Eu2+ are investigated. Pellet samples of KCl:Eu2+ were given doses of up to 200 kGy at the Louisiana State University Synchrotron facility. After synchrotro...
Ultra-trace analysis of 41Ca in urine by accelerator mass spectrometry: an inter-laboratory comparison [0.03%]
加速器质谱测定尿液中41Ca的超痕量分析：实验室间比对试验
George S Jackson,Darren J Hillegonds,Paul Muzikar et al.
George S Jackson et al.
A 41Ca interlaboratory comparison between Lawrence Livermore National Laboratory (LLNL) and the Purdue Rare Isotope Laboratory (PRIME Lab) has been completed. Analysis of the ratios assayed by accelerator mass spectrometry (AMS) shows that ...
Stable platinum isotope measurements in presolar nanodiamonds by TEAMS [0.03%]
利用TEAMS进行前期太阳纳米钻石中铂金稳定同位素的测量
A Wallner,K Melber,S Merchel et al.
A Wallner et al.
Nanodiamonds are stardust grains commonly found in primitive meteorites. They survived the formation of the solar system and kept their own individuality. Measurements of trace-element isotopic signatures in these grains will help understan...
P Steier,E Hrnecek,A Priller et al.
P Steier et al.
VERA, the Vienna Environmental Research Accelerator, is especially equipped for the measurement of actinides, and performs a growing number of measurements on environmental samples. While AMS is not the optimum method for each particular pl...
S Yoshida,C O Reinhold,J Burgdörfer et al.
S Yoshida et al.
We demonstrate that circular wave packets in high Rydberg states generated by a pulsed electric field applied to extreme Stark states are characterized by a position-dependent energy gradient that leads to a correlation between the principa...
Installation of hybrid ion source on the 1-MV LLNL BioAMS spectrometer [0.03%]
混合离子源在LLNL生物AMS光谱仪上的安装调试工作
T J Ognibene,G A Salazar
T J Ognibene
A second ion source was recently installed onto the LLNL 1-MV AMS spectrometer, which is dedicated to the quantification of 14C and 3H within biochemical samples. This source is unique among the other LLNL cesium sputter ion sources in that...
Miranda J Sarachine Falso,Bruce A Buchholz
Miranda J Sarachine Falso
The past decade has seen an explosion in use of the (14)C bomb-pulse to do fundamental cell biology. Studies in the 1960's used decay counting to measure tissue turnover when the atmospheric (14)C/C concentration was changing rapidly. Today...