Parkinsons and benzene, radiation

I am helping an elderly family member with Parkinson's. He is veteran who served active duty in the US Navy during late 1940s. He was repeatedly exposed to benzene and radiation from more than a dozen atomic bombs.

I am seeking any documentation that includes the job description of a Radioman in the U. S. Navy during the late 1940s OR anyone who was in that job during that time period who is wiling to state that they used Benzene as a cleaning solvent as part of the job. Please contact me asap. Thanks.

Thank you so much! I was wrong on the date range - it's the early 1950s. But this is very helpful and I greatly appreciate your help. Thanks!