Analytical X ray instruments produce intense beams of ionizing radiation that is used for diffraction and fluorescent studies. At U of T, there are also numerous X ray producing machines for medical and/or dental applications. The chest X ray procedure often involves a view from the back to the front of the body (PA view) as well as a side view (lateral view). Other X rays are taken from front to back of the body (AP view). Occasionally, different angles are considered to interpret certain specific areas.