Abstract:

In order to solve the problem of internal and external exposure risk of trainees exposed to nuclear radiation environment during emergency or disposal training of nuclear accidents or other nuclear-related scenarios, VR technology was applied to simulate the training process by taking nuclear radiation monitoring training as an example. Firstly, the attenuation calculation method of multi-layer of point source radiation field was constructed. Secondly, the detector angular response curve was simplified by piecewise linearity to simulate the response of the detector to the azimuth angle. Then, a real-time calculation model of virtual detector reading considering object occlusion as well as detector angle response was developed. Finally, a fully immersive virtual training system was constructed. The results show that the dose rate at the virtual detector position calculated by the system is consistent with the results of Rad Pro Calculator of American Health Physics Society (HPS) which is in line with the physical law. The detector readings are corrected according to the azimuth and spatial position of the detector, which can restore the changes of the detector display values during the real detection process, and the trainees get feedback similar to the real nuclear radiation monitoring during the virtual training process. The system optimization design from real-time virtual radiation field calculation, nuclear radiation monitoring equipment simulation to full immersion experience of personnel can avoid the impact of nuclear radiation on the health of trainees in eukaryotic environment training, and help to improve the level of emergency radiation monitoring capability of trainees.

Key words: nuclear radiation monitoring, fully immersive, virtual reality (VR), training system, radiation fields, angular response, levels of detail (LOD)