Of course you can, but it is unlikely that you will be able to do it yourself. Your best way is to get a certified arborist report; my sister used this service when she needed a tree survey. The experts at Evans West Valley Spray will not only inspect your oak tree visually, but also with an ultrasound. This gives a more complete picture of the density of the wood and helps identify cavities or decay. You can read more about this technology on their website.