英国科学家最近利用正电子研制成功一种金属探伤仪，可发现金属内微小的缺陷。英国AEA公司发明的这种仪器可将正电子束扫描到需要检测的金属上，当正电子进人金属后便与金属内的负电子发生湮灭现象。金属内部不同结构处正、负电子湮灭时释放出的辐射现象有所不同，因而该仪器分 British scientists recently used positron to develop a metal flaw detector that can detect tiny defects in the metal. The instrument invented by the British company AEA can scan the positron beam onto the metal to be detected, annihilating it with negative electrons in the metal as it moves into the metal. Different structures within the metal positive and negative electron annihilation emitted radiation phenomena are different, so the instrument points