Lecture21 - Compton Scattering 2 2 1 ' c m h h h E C + = =...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
ENU 4612C/5615C Nuclear Radiation Detection and Instrumentation Lecture 21 Gamma-Ray Spectroscopy
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
General Requirements on Gamma-Ray Spectroscopy • Gamma-rays are “visible” only through the secondary electrons created in the major gamma-rays interactions. • The detector must: – Promote γ to e ‾ conversions – Measure the energy of e ‾ ’s
Background image of page 2
Gamma-Ray Interactions • Photoelectric absorption – Low energy predominant – Strongly enhanced in high-Z materials • Compton scattering – Medium energy predominant – Partial γ to e ‾ energy transfer • Pair Production – High energy predominant
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Photoelectric Absorption dep E ν h dE dN h photoelectron
Background image of page 4
Compton Scattering ) cos 1 ( 1 ' 2 0 θ ν + = c m h h h h h = = 0 ' 2 0 2 1 ' c m h h h π + = = h e ' h recoil electron
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Compton Scattering
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 14
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 16
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Compton Scattering 2 2 1 ' c m h h h E C + = = = 2 For 2 c m h >> ( ) MeV c m E C 256 . 2 2 = Pair Production Gamma-Ray Interaction Probabilities Models of Gamma-Ray Detector Behavior Assume all e (and e ) kinetic energy is absorbed (detector dimensions >> range) Small Detector : all secondary electromagnetic rays escape Large Detector : all such rays interact further and their energy is captured Intermediate Detector : some escape, some capture Small Detector Small Detector Spectra Large Detector Large Detector Spectrum Intermediate Detector (i.e., most detectors) Intermediate Detector Spectra...
View Full Document

This note was uploaded on 12/10/2011 for the course ENU 4612c taught by Professor Ghita during the Fall '11 term at University of Florida.

Page1 / 16

Lecture21 - Compton Scattering 2 2 1 ' c m h h h E C + = =...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online