The ASDEX-Upgrade (AUG) tokamak is equipped with several AXUV diode arrays [1] that detect electromagnetic radiation from a wide spectral range, albeit with a non-uniform spectral responsivity. This diagnostic has significantly higher time resolution than foil bolometers, and it is suitable for examining fast phenomena such as shattered pellet injection (SPI). Potential applications of the AXUV diagnostics include providing data about the radiation localization and radiated power during SPI, since these carry some information regarding the pellet material deposition. However, due to the characteristics and inevitable degradation of the AXUV diodes, absolute power measurements are subject to large systematic uncertainties in dynamic scenarios, of which neon-doped SPI is a great example. This motivated the development of a synthetic diagnostic for the AUG AXUV system, specifically for the two arrays nearest to the location of the SPI. The synthetic diagnostic was developed in Cherab [2] and provides a way to further our understanding of the underlying physics during SPI and how the diodes measure the radiation in these circumstances. The details of the synthetic diagnostics are presented in the talk, with applications on AUG SPI simulations [3] that were carried out in JOREK [4]. The synthetic data is also compared to real measurements performed during the 2022 SPI campaign. References: [1] M. Bernert et al., “Application of AXUV diode detectors at ASDEX Upgrade,” Rev. Sci. Instrum., vol. 85, no. 3, p. 033503, Mar. 2014, doi: 10.1063/1.4867662. [2] M. Carr et al., “Towards integrated data analysis of divertor diagnostics with ray-tracing,” presented at the 44th EPS Conference on Plasma Physics, Belfast, Northern Ireland (UK), 2017. [3] W. Tang et al., “Non-linear shattered pellet injection modelling in ASDEX Upgrade,” Dec. 04, 2024, arXiv: arXiv:2412.03112. doi: 10.48550/arXiv.2412.03112. [4] M. Hoelzl et al., “The JOREK non-linear extended MHD code and applications to large-scale instabilities and their control in magnetically confined fusion plasmas,” Nucl. Fusion, vol. 61, no. 6, p. 065001, May 2021, doi: 10.1088/1741-4326/abf99f.