코발트-60/니켈-60 와 같은 경우 감마선 방출 스펙트럼은 아주 단순하며, 반면 아메리슘-241/넵투늄-237 혹은 이리듐-192/백금-192의 경우에는 복잡한데 이는 여러 에너지 준위가 가능하다는 것을 보여준다.
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