This is a two part question.

I am thinking of going into the nuclear field and medicine.

Even though my background is clean, I don’t know what to expect for them to find.

What type of a background check should I expect going into these career fields?
And what other careers have background checks relating to your past history?
If you want to know, some employers base not only on criminal background, but credit and medical as well.

I have bad credit and the medical history isn’t very well either.

Background Check, Background Checks, Bad Credit, Career Fields, Careers, Criminal Background, Medical History, Medicine, Nuclear Field