The aim is to introduce and characterize a new experimental demonstrative model contributing to the increase of measurement accuracy, in terms of Minimum Detectable Activity (MDA) and Background reduction, for the analysis of samples having low concentrations in tritium and radiocarbon on Quantulus 1220™. The clue is related to the qualitative and quantitative differences between tritium and carbon-14 inventories of the pulp used to manufacture the cups involved in non-catalytic combustion of samples by flame oxidation method. The quality of the experimental results depends on the temporal origin of the wood from which the pulp/cellulose was extracted/purified, the specific inventory contributing to the threshold level of the MDA for the beta-emitting radionuclide to be investigated. Finally, the aim is to create and to use such a 100% old cellulose combustion cups for determining low concentrations of these radionuclides. It may be obtained by an adapted technology following the literature data, and may be recommended for routine analyzes of environmental samples coming from areas with no nuclear or minor nuclear influences, and also for low-level biological samples. This first attempt resulted in improvement of measurement performances up to 400% for carbon-14 and by approx. 50% for tritium.

中文翻译：

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环境和生物样品在氧化剂 M307 和等效物上的半自动燃烧；减少背景的新解决方案

目的是引入和表征一种新的实验示范模型，有助于提高测量精度，在最小可检测活度 (MDA) 和背景降低方面，用于在 Quantulus 1220™ 上分析具有低浓度氚和放射性碳的样品。该线索与用于制造涉及通过火焰氧化法非催化燃烧样品的杯子的纸浆的氚和碳 14 存量之间的定性和定量差异有关。实验结果的质量取决于提取/纯化纸浆/纤维素的木材的时间来源，特定库存有助于确定待研究的 β 发射放射性核素的 MDA 阈值水平。最后，目的是创建和使用这种 100% 旧的纤维素燃烧杯来确定这些放射性核素的低浓度。它可以根据文献数据通过适应技术获得，可推荐用于来自无核或微核影响地区的环境样品的常规分析，也可用于低水平生物样品。第一次尝试使碳 14 的测量性能提高了 400%，大约提高了 14%。50% 为氚。第一次尝试使碳 14 的测量性能提高了 400%，大约提高了 14%。50% 为氚。第一次尝试使碳 14 的测量性能提高了 400%，大约提高了 14%。50% 为氚。