Triton Nucleus & C14: Radiogenic Properties & Instability

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Discussion Overview

The discussion revolves around the radiogenic properties of the tritium isotope of hydrogen and the instability of carbon-14, exploring the underlying principles that contribute to the stability and instability of these isotopes. The scope includes theoretical aspects of nuclear stability and potential connections to models such as the semi-empirical mass formula and quark theory.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Rieman Zeta asks what makes tritium radiogenic and why carbon-14 is unstable compared to stable isotopes carbon-12 and carbon-13.
  • Another participant suggests that the excess of neutrons contributes to the instability of tritium and carbon-14, noting their respective neutron counts.
  • Rieman Zeta expresses interest in understanding the criteria for stability and instability in isotopes, questioning the right number of neutrons needed for stability.
  • A later reply mentions the concept of a stability band and discusses how too few or too many neutrons can lead to different types of decay, while also referencing a chart of nuclides for further exploration.
  • Participants propose that the semi-empirical formula or quark theory could be relevant to understanding these stability issues.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specific criteria for stability and instability, and multiple views on the underlying principles are presented, indicating an unresolved discussion.

Contextual Notes

The discussion includes references to the stability band and types of decay without fully resolving the mathematical or theoretical frameworks involved. There is also mention of external resources for further information.

rieman zeta
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To all: In some detail what makes the tritium isotope of hydrogen radiogenic?

And since C12 and C13 are both stable what makes C14 unstable?

Thanks
Rieman Zeta
 
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rieman zeta said:
To all: In some detail what makes the tritium isotope of hydrogen radiogenic?

And since C12 and C13 are both stable what makes C14 unstable?

Thanks
Rieman Zeta
In both cases and excess of neutrons!

T has 1 p and 2n. In the deuteron, the pn combination is fairly stable, but adding one more neutron pnn allows for less stability.

Similarly for C14, 6p+8n, versus 6p6n or 6p7n, in C12 and C13, respectively.
 
Thank you for your reply. I was hoping for a connection to some underlying principle. For example, if you add the right number of neutrons then stability ensues. The wrong number and you get instability.

What is the right and wrong #s criterion.

Perhaps it could be approached through the semi-empirical formula or quark theory?

The former I have a some and the latter only superficial knowledge.

Rieman Zeta
 
rieman zeta said:
Thank you for your reply. I was hoping for a connection to some underlying principle. For example, if you add the right number of neutrons then stability ensues. The wrong number and you get instability.
Well there is that. There is more or less a stability band. On either side, one finds a radionuclide, but its not very straightforward. To few neutrons will usually lead to positron emission or electron capture. To many neutrons will lead to beta or alpha decay, but alpha decay is restricted to the heavy elements from Bi on up (Bi 210 is the lightest nuclide to undergo spontaneous alpha emission).

One can find the chart of nuclides here - http://wwwndc.tokai.jaeri.go.jp/CN04/index.html

rieman zeta said:
Perhaps it could be approached through the semi-empirical formula or quark theory?
I'll get back to you on that.
 
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