The Georgetown program is a solid program with an emphasis on basic science research. They give you a whole year of research time, and the chair is active in lab science.
They are a little bit lagging in technology, except for the Cyberknife machines that they have. The department is small with old machines. Also, there are only 4 residents total, so there will be only one spot when you apply.
It will be a good place to train if you are motivated and interested in science. All the resources are available and they will be supportive, but it won't be spoon-fed to you.