Methods are presented for rapid determination of relative efficiencies of Faraday cups in a multicollector array with movable cups and of Daly or electron multiplier detector dead time and gain values. The Faraday calibration approach is based on measuring the same isotopic ratio in two sequences with different collector configurations having one collector in common. Changes in thermal fractionation during the two measurement sequences are monitored using the same two collectors. Since the relative efficiencies are determined by measuring the same ratio in different cups corrected for time-dependent changes in fractionation, it is unnecessary to use a standard of known composition and calculations are simple, not requiring the solution of multiple equations. Determination of dead time and gain values for a Daly detector are shown based on multidynamic measurements of masses 207, 206, and 208 from Pb standard SRM982 in two sequences consisting of L1-Daly-H1 and Daly-H1-H2. This provides two equations that can be solved for Daly dead time and gain. This method uses static measurements and is therefore insensitive to signal instability. It also does not require use of a standard of known isotopic composition. The potential of using known cup efficiencies to help determine absolute isotopic abundances is discussed.

中文翻译：

---

一种在移动式多收集器质谱仪上快速校准法拉第和离子计数检测器的简单方法。

提出了快速确定具有可移动杯的多收集器阵列中法拉第杯相对效率以及Daly或电子倍增器检测器死区时间和增益值的相对效率的方法。法拉第校准方法是基于在两个序列中测量相同的同位素比率，而两个序列具有不同的收集器配置，其中一个收集器是相同的。使用相同的两个收集器监控两个测量序列中的热馏分变化。由于相对效率是通过在校正了随时间变化的分馏杯中的不同杯子中测量相同比例来确定的，因此无需使用已知成分的标准，并且计算简单，不需要求解多个方程。基于Pb标准SRM982对质量207、206和208的多动态测量，显示了Daly检测器的死区时间和增益值，该质量由L1-Daly-H1和Daly-H1-H2组成两个序列。这提供了两个方程，可以解决戴利的死区时间和增益。该方法使用静态测量，因此对信号不稳定不敏感。它还不需要使用已知同位素组成的标准。讨论了使用已知杯效率来确定绝对同位素丰度的潜力。它还不需要使用已知同位素组成的标准。讨论了使用已知杯效率来确定绝对同位素丰度的潜力。它还不需要使用已知同位素组成的标准。讨论了使用已知杯效率来确定绝对同位素丰度的潜力。