Differences between X-rays and Gamma rays

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Discussion Overview

The discussion revolves around the differences between X-rays and Gamma rays, focusing on their origins, definitions, and the implications of these classifications within the electromagnetic spectrum. Participants explore the nuances of how these terms are used in various contexts, including their production mechanisms and the historical background of their naming.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that X-rays originate from electrons while Gamma rays originate from the nucleus, but question the consistency of this definition given that both can be produced by the Bremsstrahlung process involving decelerating electrons.
  • Others argue that the distinction is primarily a matter of naming conventions for electromagnetic radiation across different frequency ranges, indicating that both X-rays and Gamma rays are essentially photons.
  • A participant notes that definitions vary among sources, with some defining Gamma rays strictly as those produced from nuclear processes and others categorizing any high-frequency radiation as Gamma rays, suggesting a more flexible interpretation of these terms.
  • Another participant highlights the historical context of the naming, mentioning that Gamma radiation was one of the original categories of nuclear decay, which may influence current definitions.
  • Areas of Agreement / Disagreement

    Participants express differing views on the definitions and classifications of X-rays and Gamma rays, indicating that there is no consensus on a singular definition or understanding of their differences.

    Contextual Notes

    Definitions of X-rays and Gamma rays may depend on specific contexts and sources, leading to potential ambiguities. The discussion reflects varying interpretations based on historical, physical, and practical considerations.

Rev. Cheeseman
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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 produced X-rays and Gamma rays by 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?
 
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The last time this got asked I discovered that some sources regard gamma rays as "anything produced from the nucleus" and x rays as "anything produced from the electrons beyond UV", while some sources do as @vanhees71 says and label anything above a certain frequency as gamma rays. I think the latter is more common, especially as we now understand clearly that it's all just EM and the source doesn't really make a difference. I'd presume whatever source you are reading about Bremsstrahlung is using that definition too.

Either way, it's just a label. It's all photons.
 
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Indeed, em. decays of nuclei are usually in the ##\gamma##-ray range. That's actually, where the name comes from, because it was one of the three known kinds of nuclear decay, dubbed ##\alpha##-, ##\beta##-, and ##\gamma##-radiation.

An important exception is Thorium-229:

https://en.wikipedia.org/wiki/Nuclear_clock#The_history_of_the_nuclear_clock

See particularly Reference 6+7 therein.
 
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