Here's one paper on the subject. There are others, but I've run out of steam for trawling through Scholar and arXiv. Radiation hazard of relativistic space fli

Here's one paper on the subject. There are others, but I've run out of steam for trawling through Scholar and arXiv. Radiation hazard of relativistic space flight https://arxiv.org/abs/physics/0610030 https://arxiv.org/abs/physics/0610030