Positrons and electrons annihilated each other, emitting gamma rays detected by Fermi's gamma-ray burst detector, researchers said.
正电子和电子会相互湮灭而发射出的伽玛射线，再由费米的爆发检测器所检测到，研究人员说。
2
It activates a gamma-ray detector that will spot a nuclear blast as much as 100 miles away and instantly shut all the airvents. He had it tested before moving in.
它能使伽马射线嗅探器工作——嗅探100英里外核爆炸并立即关闭所有通风口。
3
Natural gamma logging is a kind of most basic methods of well logging in cased Wells which measure with gamma ray detector along well during logging.