The re-entry of a vehicle into Earth's atmosphere either from near-Earth orbit or from interplanetary trajectories is the most critical phases of a space mission for materials, since space capsules and spacecraft surfaces are brought to relatively high temperatures (>2000 °C) and are subject to the high thermal fluxes. The most complex requirements of the on-ground CIRA hypersonic Plasma Wind Tunnel (PWT) test campaigns are to measure and monitor the high heat fluxes, the correlated surface Recession Rate and Surface Temperatures affecting the behavior of Thermal Protection System (TPS) materials which make up the surface and sub-surface components of the spacecraft's outer layer.

For these tests, the recession rate will be obtained by Surface Layer Implantation (SLI), monitored by the gamma ray emission from ⁷Be implanted into the test material, and the surface temperature by Dual Color free emissivity Infrared Thermography (DCIT). So the first purpose of the paper, in the recession rate determination, is to present the γ-ray detection efficiency of a LaBr₃(Ce) crystal by GEANT4 simulation using the radioactive ions, to be implanted by means of the CIRCE accelerator, and the use of γ-rays to monitor their removal during the ablation process. At the same time, for temperature determination, is to evaluate the possibility of carrying out free emissivity temperature measurements in unsteady conditions.

On the basis of the results, possible validation tests are outlined, through the use of the intense radioactive ⁷Be beam available at the 3MV Pelletron tandem accelerator of the CIRCE Laboratory and the GHIBLI-PWT facility at CIRA, to present the combined novel, contactless and non-intrusive diagnostics for the simultaneous recession rate and temperature determinations.

从太空轨道或行星际轨道重新进入地球大气层是材料太空飞行任务中最关键的阶段，因为太空舱和航天器表面被置于相对较高的温度下（> 2000°C）并承受高热通量。地面CIRA高超声速等离子风洞（PWT）测试活动的最复杂要求是测量和监视高热通量，相关的表面回缩率和表面温度会影响热防护系统（TPS）材料的性能，飞船外层的表面和次表面组件。

对于这些测试，将通过表面层注入（SLI）获得衰退率，并通过将⁷ Be注入到测试材料中的伽马射线发射进行监测，并通过双色自由发射红外热成像（DCIT）获得表面温度。因此，本文的第一个目的是确定衰退率，目的是通过使用放射性离子的GEANT4模拟，介绍通过CIRCE加速器注入的LaBr ₃（Ce）晶体的γ射线探测效率，以及在消融过程中使用γ射线监测其去除情况。同时，为了确定温度，要评估在不稳定条件下进行自由发射率温度测量的可能性。

根据结果​​，概述了可能的验证测试，方法是使用CIRCE实验室的3MV Pelletron串联加速器和CIRA的GHIBLI-PWT设施提供的强放射性⁷ Be射线，以展示组合的新型，非接触式同时进行衰退率和温度测定的非侵入式诊断。