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COMPTON SCATTER-SCATTER ANGLE

Physics

COMPTON SCATTER-SCATTER ANGLE

1. The scatter angle (θ) is the angle between the scattered photon and the incoming photon.
2. Photons can be scattered in any direction but electrons can only move forwards.
3. The change in photon energy is determined only by the scatter angle

DIRECT HIT
4. The electron will travel forwards and receives maximum energy.
5. The scattered photon travels backwards (θ = 180°) and receives minimum energy.

GLANCING HIT
6. The electron travels at 90° and receives minimum energy.
7. The scattered photon goes almost straight forwards (θ = 0°) and receives maximum energy.
8. Thus, as scatter angle ↑, scattered photon energy ↓


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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