Linear attenuation coefficient

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Discussion Overview

The discussion revolves around the concept of the linear attenuation coefficient, specifically whether it is a constant for a given material or if it varies with the thickness of the material. The scope includes theoretical considerations and practical implications of the coefficient in relation to material thickness.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants propose that the linear attenuation coefficient is independent of the thickness of the material, as it is described as "per unit thickness."
  • Others argue that the coefficient must be scaled according to the actual thickness being used, suggesting that it is not a constant when considering practical applications.
  • A participant questions what is being attenuated, indicating a need for clarification on the context of the discussion.
  • There is a discussion about the implications of insulation thickness on power loss, with one participant asserting that thinner insulation results in greater power leakage.

Areas of Agreement / Disagreement

Participants express differing views on whether the linear attenuation coefficient is a constant or dependent on thickness, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Some assumptions about the definitions and context of attenuation are not fully clarified, and there are unresolved mathematical implications regarding the scaling of the coefficient with thickness.

Anupama
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Is linear attenuation coefficient a constant for a given material or will it depend on the thickness of the material?
 
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It is "per unit thickness." To me, that implies that it is independent of the thickness of the material.
 
-1

"per unit thickness" usually means the attenuation per meter, or per foot of thickness depending on the units.

You have to scale it to the actual thickness you are using.

So for example if you had insulation rated at 1W per degree C per square meter per unit thickness but you were only using a sheet 0.1m thick, then the loss would be 10W per degree C per square meter.
 
Attenuation of what?
 
CWatters said:
So for example if you had insulation rated at 1W per degree C per square meter per unit thickness but you were only using a sheet 0.1m thick, then the loss would be 10W per degree C per square meter.
you mean 0.1W ?
 
ChrisVer said:
you mean 0.1W ?
No. The thinner the insulation the more power leaks through it. If 1W leaks through a unit thickness (1m) then ten times as much (10W) leaks through a 0.1m thick layer.
 

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