What graduate major deals the most with radiometry?

[rtareen]

I'm currently a sophomore physics major in undergraduate. I'm doing physics because I want my undergrad education to be really general. I want a goof foundation. What I'm really interested in is radiometry, which I believe is like optics but for all wavelengths, not just visible ones. I want to know about radiation, how to shield from it, how to interfere with it, etc.

Does anyone know what I should get into if I want to do this? Are there any programs that deal only with radiometry?

 

[CPW]

Are you aware of the field of medical physics? www.aapm.org