The SPALAX-NG is a new-generation system that is designed to detect radioactive xenon at trace levels in the atmosphere following a nuclear explosion or civilian source release. This new system formed part of a validation program led by the Provisional Technical Secretary of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) Organization. In this study, the first SPALAX-NG unit was tested for six months between October 2018 and April 2019 at the CEA/DIF premises near Paris, France. This test period provided an outstanding opportunity to illustrate the high level of detectability and reliability of the system. The data availability obtained over this period was approximately 99%, which was well above the CTBT Data Availability criteria of 95%. The data reliability was demonstrated by a comparison with a collocated SPALAX-1 unit (former version of SPALAX) and by re-measuring several samples at the CTBT-certified French laboratory FRL08. The high sensitivity to the detection of the four relevant radioxenon isotopes was fully demonstrated and enabled the recording of a major dataset for western Europe. A large set of isotopic ratios was measured, which enabled the discrimination criteria between civilian sources and nuclear test signatures to be refined.

SPALAX-NG是新一代系统，旨在检测核爆炸或民用源释放后大气中痕量水平的放射性氙。这个新系统是由全面禁止核试验条约组织（CTBT）临时技术秘书领导的验证计划的一部分。在这项研究中，第一个SPALAX-NG装置在2018年10月至2019年4月之间在法国巴黎附近的CEA / DIF场所进行了六个月的测试。该测试期为说明系统的高可检测性和可靠性提供了绝佳的机会。在此期间获得的数据可用性约为99％，远高于《禁核试条约》的数据可用性标准95％。通过与并置的SPALAX-1单元（SPALAX的旧版本）进行比较，以及在经过CTBT认证的法国实验室FRL08中重新测量多个样品，证明了数据的可靠性。充分证明了对四个相关放射性氙同位素的检测具有很高的敏感性，并可以记录西欧的主要数据集。测量了大量的同位素比率，这使得可以完善民用来源与核试验签名之间的区别标准。