Atmospheric transport modeling has been used to interpret the unprecedented number of multi-isotope detections of radioxenons observed during the six months of the qualification process by the Comprehensive Nuclear-Test-Ban Treaty Organization of the new SPALAX-NG system (Système de Prélèvement Automatique en Ligne avec l’Analyse du Xénon - Nouvelle Génération). Highest ¹³³Xe activity concentrations were found to be systematically associated with the concomitant measurement of several other radioxenons at the prevailing wind direction of north/northeast pointing to the Institute for Radio Elements (IRE), a medical isotope production facility located in Fleurus (Belgium). The lowest ¹³³Xe activity concentrations were not associated with a prevailing wind direction or other radioxenons, indicating the contribution of distant sources (global background). The IRE's average source terms for ^133mXe and to a lesser extent for ¹³³Xe (slightly overestimated by a factor of 1.7) showed good agreement with the literature values, while corrections by a factor of ~23 and ~53 were proposed for ^131mXe and ¹³⁵Xe since the initial values were underestimated. However, detections of ^131mXe alone and some low-activity concentrations of ¹³³Xe associated with only one of the other radioxenons could not be linked to the IRE releases. Analysis of these cases suggests the contribution of local source releases that have been difficult to identify to date. In addition to the global background, releases from such local sources, if not identified, could affect the analysis of the isotopic ratios measured following a nuclear test. The characterization of these local contributions is now possible owing to the capacity of the SPALAX-NG and other new generation measurements systems.

新的SPALAX-NG系统的全面禁止核试验条约组织（SystèmedePrélèvementAutomatique en）使用大气传输模型来解释在资格鉴定过程的六个月内观察到的放射性氙多同位素检测的空前数量Ligne avec l'Analyse duXénon-NouvelleGénération）。发现最高的¹³³ Xe活度浓度与在北/东北向盛行的风向同时指向指向阿根廷放射性元素研究所（IRE）的医疗同位素生产设施的其他几种放射性氙的测量系统相关。 。最低¹³³氙的活动浓度与盛行的风向或其他放射性氙无关，表明遥远的来源（全球背景）的贡献。该IRE对平均源项^133米的Xe和用于在较小程度上¹³³的Xe（由1.7倍稍微高估）显示出与文献值一致，同时通过的〜23和〜53倍校正提出了^131米的Xe和¹³⁵ Xe，因为初始值被低估了。但是，仅检测到^131m Xe和一些低活性浓度的¹³³仅与其他放射性氙之一相关的Xe无法链接到IRE版本。对这些案例的分析表明，迄今为止尚难以确定的本地来源释放的贡献。除全球背景外，如果未确定从此类地方来源的释放，可能会影响对核试验后测得的同位素比值的分析。由于SPALAX-NG和其他新一代测量系统的功能，现在可以表征这些本地贡献。