Fluence Explained: What is it & How Does it Work?

  • Context: Undergrad 
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SUMMARY

Fluence is defined as the total number of particles that intersect a unit area over a specific time interval, measured in particles per square meter (m–2). The discussion highlights a common misconception that fluence cannot be greater than zero without a timing interval, which is essential for calculating flux. The distinction between fluence and flux is clarified, emphasizing that fluence represents an integrated measure over time, while flux is a snapshot measurement. Understanding this difference is crucial for accurately applying these concepts in physics.

PREREQUISITES
  • Understanding of basic physics concepts, particularly in particle dynamics.
  • Familiarity with the definitions of flux and fluence.
  • Knowledge of units of measurement in physics, specifically m–2.
  • Ability to interpret scientific literature and definitions, such as those found in physics textbooks or Wikipedia.
NEXT STEPS
  • Research the mathematical relationship between fluence and flux in particle physics.
  • Explore applications of fluence in radiation physics and its implications in medical imaging.
  • Study the concept of particle density and its relation to fluence in various physical contexts.
  • Investigate the historical development of the concepts of fluence and flux in scientific literature.
USEFUL FOR

Students and professionals in physics, particularly those studying particle dynamics, radiation physics, or anyone seeking to clarify the distinction between fluence and flux in scientific contexts.

rem45
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I am new to the fluence concept which is apparently the number of particle passing through an area.

However how can this quantity ever be greater than zero...? In my mind there needs to be a timing interval to compute how many particles are passing through the area which I know is referred to as the flux.

My professor explains this concept as a snapshot in time but that to me is flux. As the snapshot in time becomes infinitely small this 'fluence' should go to zero... right?

Any thoughts?
 
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Per wiki:

In physics, fluence is the flux (either particle or radiative flux) integrated over time. For particles, it is defined as the total number of particles that intersect a unit area in a specific time interval of interest, and has units of m–2 (number of particles per meter squared).
 

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