I had read elsewhere that water is a useful shield. A quick search found this document, that mentions the danger of secondary particles. https://www.nasa.gov/w

I had read elsewhere that water is a useful shield. A quick search found this document, that mentions the danger of secondary particles. https://www.nasa.gov/wp-content/uploads/2009/07/284275main_radiation_hs_mod3.pdf?emrc=f9d9bd https://www.nasa.gov/wp-content/uploads/2009/07/284275main_r...