Update: Radiation sensor fine-tunes cancer treatments

New implantable device promises to offer doctors more precision in treating patients with cancerous tumors. The tiny dosimeter is about 2 centimeters long, to fit inside a hypodermic needle, making it easy to inject the device into the body. The detector is simple - a modified capacitor attached to an inductor, both of which are encased in a glass capsule. If an implanted dosimeter indicates that a tumor received less radiation than the treatment plan had specified, the hospital staff could revise the patient's therapy.