Purdue University scientists are building a wireless device that could be implanted in tumors to register the dose of radiation received. According to Purdue, the device is a passive wireless transponder activated by electrical coils placed next to the body. The units are the size of a grain of rice and will enable physicians to determine the position of tumors during treatment. Researchers have tested a dime-size prototype and expect to have the miniature version completed by summer 2006.

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