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首页> 外文期刊>Journal of Radioanalytical and Nuclear Chemistry: An International Journal Dealing with All Aspects and Applications of Nuclear Chemistry >Exploring background variability of a low-level (quartz) gas proportional counter using pulse shape and distribution analysis
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Exploring background variability of a low-level (quartz) gas proportional counter using pulse shape and distribution analysis

机译：利用脉冲形状和分布分析探索低水平（石英）气体比例计数器的背景可变性

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The NIST low-level beta counting system is designed to capture digitally and timestamp each event for retrospective analysis. As a result, low and stable backgrounds are achieved and lead to extremely low detection and quantification limits for measuring, e.g., ~(14)C of atmospheric gases and aerosol. The objective here is to explore the variability of the background count rate (counts per day) of several small (1 mL) freshly-assembled gas proportional counters (GPCs). The mean is 14.0 day~(-1) with 95 % confidence limits 11.2-16.8 day~(-1). The raw count per day data was non-normal and so a Log transformation was applied to achieve normality and to rigorously compute normal tolerance limits. Back in the original space such (95 % confidence, 95 % coverage) tolerance limits were 2.5-47.8 day~(-1). These limits are taken as acceptance criteria for any GPCs assembled in the future.
机译：NIST低级Beta计数系统旨在对每个事件进行数字捕获和时间戳记，以进行回顾性分析。结果，获得了低而稳定的背景，并导致极低的检测和定量极限，以用于测量例如大气和气溶胶的〜（14）C。此处的目的是探索几个小的（1 mL）新鲜组装的气体比例计数器（GPC）的本底计数率（每天计数）的可变性。平均值为14.0天〜（-1），95％置信限为11.2-16.8天〜（-1）。每天的原始计数数据是非正常的，因此应用Log转换来实现正常性并严格计算正常的公差极限。回到最初的空间（95％置信度，95％覆盖率），公差极限为2.5-47.8天〜（-1）。这些限制将作为将来组装的所有GPC的验收标准。

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