The paper presents complementary approaches based on experimental and numerical works to address the behavior of tokamak-relevant tungsten particles loaded with tritium. Sampling of particles inside the WEST tokamak have been realized thanks to an in situ particle collection system called Duster Box. This method allowed to identify various types of tungsten particles among them spherical shaped micro-particles between 5 µm and 30 µm in diameter. Based on these results a surrogate tungsten powder has been provided by means of spheroidization process and sieving method. Moreover, the powder tritium retention capacity was measured and specific activities of 90 MBq.g⁻¹ and 280 MBq.g⁻¹ were obtained for particles with 17 µm and 11.5 µm median diameters, respectively. Considering such tritium activities trapped in the particles, Monte-Carlo simulation were performed to estimate the electrostatic self-charging rates and the corresponding electrical charge carried by the radioactive tungsten dust. The results of these experiments provide robust data for the assessment of the dispersion of toxic/radioactive material in the environment that could follow a loss of containment.

本文介绍了基于实验和数值工作的互补方法，以解决托卡马克相关的钨loaded颗粒的行为。得益于名为Duster Box的原位颗粒收集系统，已经实现了WEST托卡马克内部的颗粒采样。该方法允许鉴定各种类型的钨颗粒，其中包括直径在5μm和30μm之间的球形微粒。基于这些结果，已经通过球化工艺和筛分方法提供了替代钨粉。此外，测量了tri的粉末保留容量，并且比活为90 MBq.g ^-1和280 MBq.g ^-1分别获得中值直径为17 µm和11.5 µm的颗粒。考虑到颗粒中捕获的这种activities活度，进行了蒙特卡洛模拟，以估计静电自充电率以及放射性钨尘携带的相应电荷。这些实验的结果为评估有毒/放射性物质在环境中的散布（可能随密封性降低）提供了可靠的数据。