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* X-rays are literally death rays. A man ex posed to strong enough fays for a few minutes would die within a few months. A few seconds' exposure could cause temporary and possibly permanent sexual sterility, as well as severe blood changes. These and other effects can be cumulative, picked up fatally second by second through several years. The machines at G.E. are housed in windowless buildings with 18-inch concrete walls to keep any death-dealing X-rays from getting out, and every worker in this laboratory carries an X-ray plate strapped to his wrist to give warning if he is unknowingly exposing him self.