Neurodocs Hosts Online Chats on Gamma Knife Radiosurgery (Business Wire)...``Treatment of Brain Tumor with Gamma Knife`` with Dr. Maurice Nicholson, neurosurgeon and Medical Director of the GKCP, on Friday, February 23 at 3 pm (Alaska Time)/7 pm ET.......``The Gamma Knife is not a knife at all, but a radiosurgical device that treats brain tumors with precisely focused 201 sources of radioactive cobalt 60....- Jan 18 5:01 PM ET