What Is Detection Efficiency in HPGe Detectors?

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Discussion Overview

The discussion revolves around the concept of detection efficiency in high purity germanium (HPGe) detectors, specifically focusing on its definition at specific gamma-ray energies and the relationship between emission probability and gamma-ray intensity.

Discussion Character

  • Exploratory
  • Technical explanation

Main Points Raised

  • Nurul Ain inquires about the meaning of detection efficiency at specific gamma-ray energy (εγ) and its relationship to emission probability and intensity.
  • One participant suggests that detection efficiency refers to the percentage of gamma-ray photons at a specific energy that are detected, noting that many photons may pass through the detector without being absorbed.
  • There is a request for formulas or equations that could be used to calculate detection efficiency, with uncertainty expressed about whether it is a constant.
  • Another participant expresses uncertainty about the existence of such formulas, indicating a need for further exploration on the topic.

Areas of Agreement / Disagreement

The discussion does not reach a consensus on the specifics of detection efficiency or the existence of formulas for its calculation, with multiple viewpoints and uncertainties present.

Contextual Notes

Participants express uncertainty regarding the relationship between emission probability and intensity, as well as the nature of detection efficiency (whether it is constant or variable).

nurul anuar
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hi there!

I am nurul ain,new member here.

I have a question regarding gamma ray detector, the high purity germanium detector or aka HPGe. What is meant by the detection efficiency at specific gamma-ray energy (εγ)? and whether the emission probability of the corresponding gamma-ray energy and the intensities are actually the same thing?

Thank you! Have a nice day!:kiss:
 
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nurul anuar said:
What is meant by the detection efficiency at specific gamma-ray energy (εγ)?

I'd guess that it refers to the percentage of photons at that specific energy that get detected. Since gamma ray photons can penetrate a lot of shielding, I imagine a large portion of them pass through the detectors without being absorbed and detected.
 
I see. You made it clearer now. Thank youu. And is there any ways/formulas/equations that can be used to find the efficiency? Or is it a constant?
 
nurul anuar said:
I see. You made it clearer now. Thank youu. And is there any ways/formulas/equations that can be used to find the efficiency? Or is it a constant?

Oh I'm sure there are. I just have no idea what those might be. :wink:
 
Drakkith said:
Oh I'm sure there are. I just have no idea what those might be. :wink:
Hehe. Guess i have to keep looking then. . Thank youu. Have a nice day!☺️
 

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