# Differences between gamma rays and X-rays [duplicate]

Some people said if it is originated from electrons then it is X-ray but if it is originated from the nucleus it is gamma ray. But people can produce X-rays and gamma rays via Bremsstrahlung process and in Bremsstrahlung process it is resulted from decelerating or braking electrons. So, gamma rays produced via Bremsstrahlung are more similar to X-rays as it is produced by electrons. Why people still calling them gamma rays although it is not generated from the nucleus?

• Note that Hermes III is considered a gamma simulator. It makes x-rays of an energy appropriate to simulate an intense gamma environment. Oct 16 '20 at 18:04
• But, yes, people get sloppy with the terminology. Also different disciplines use different terminology. Oct 16 '20 at 18:05
• @JonCuster that's what I'm thinking about, the radiation that HERMES III generated is more of a very high energy hard X-ray which energy overlap with 22 MeV gamma ray. Oct 17 '20 at 1:54
• @PM2Ring you said "Bremsstrahlung is braking radiation. It is any radiation produced due to the acceleration of a charged particle." so we can say Bremsstrahlung radiation is kind of neither X-ray nor gamma ray but the energies produced are very varied that they can encompass the whole energy levels of EM spectrum? Oct 17 '20 at 1:56
• @MohamedObeidallah Yes, Bremsstrahlung radiation can be produced in any part of the EM spectrum. Usually, Bremsstrahlung refers to the radiation given off by a charged particle travelling through an EM field, but in a sense, the EM emitted by an electron changing orbitals is also due to the acceleration of a charged particle. The same applies to a proton changing energy levels inside a nucleus, and I guess it even applies to a positron & electron annihilating each other. Oct 17 '20 at 3:10