An empirical study on the influencing factors of X-ray emissions arising from low intense ultrashort pulse laser irradiations on stainless steel will be presented. It will be shown that not only the laser beam parameters, i.e., laser power, peak intensity, polarization state and pulse repetition frequency (PRF), have strong impact on X-ray emission but also the machining and surrounding conditions will significantly affect the emitted X-ray dose rates. For example, a small geometrical distance as function of scan speed and PRF will considerably increase the X-ray emission dose. In particular, this was observed at MHz PRF potentially resulting from strong laser pulse with plasma/plume interaction in the corresponding time domain. As another effect, a strong influence of the air flow surrounding the processing zone was detected. Therefore, the air flow was varied by the distance of the fume extraction element from the processing zone. The measurements indicate, the lower the air flow, resulting from larger distance, the higher the measured X–ray dose level. In consequence, by fine-tuning the processing conditions, X-ray emissions could be detected at peak intensities below 1 · 10¹² W/cm² that has not been presented so far. The paper will be completed by a review summarizing concisely the body of knowledge by identifying more than 20 influencing factors of great impact on X-ray emissions arising from ultrashort pulse laser materials processing.