08.06.2015 Views

Gilson and Voss - Voss Associates

Gilson and Voss - Voss Associates

Gilson and Voss - Voss Associates

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

RADIATION INTERACTIONS<br />

Charged Particles<br />

- +<br />

Ionization, Excitation, Bremsstrahlung (â ), Annihilation (â )<br />

Neutrons<br />

Scattering (E > 0.025 eV)<br />

Elastic (energy <strong>and</strong> momentum are conserved)<br />

Inelastic (photon emitted)<br />

Absorption (E < 0.025 eV)<br />

Radiative Capture (n, ã)<br />

Particle Emission (n, á) (n, p) (n, n)<br />

Fission (n, f)<br />

Gamma or X-ray photons<br />

Photoelectric Effect (generally < 1 MeV)<br />

Compton Scattering (generally 200 keV - 5 MeV)<br />

Pair Production (minimum 1.022 MeV)<br />

Scattered Photon<br />

T' = T / [1 + T(1 - cos è) / m0c 2]<br />

2<br />

where c = 931.5 MeV / amu<br />

Bremsstrahlung<br />

emitted energy is ~ 1/3 of the electron energy<br />

Photon Attenuation: I<br />

x<br />

= I0e µx<br />

Interaction Probability per gram:<br />

3 3<br />

Photoelectric Z / E<br />

Compton independent of Z<br />

Pair Production Z 1<br />

µ<br />

Total<br />

= µ<br />

pe<br />

+ µ<br />

cs<br />

+ µ<br />

cc<br />

W<br />

Air<br />

= 33.9 eV per ion pair<br />

Specific Ionization = S/W (i.p. / cm)<br />

Page 54<br />

RADIATION INTERACTIONS<br />

Charged Particles<br />

- +<br />

Ionization, Excitation, Bremsstrahlung (â ), Annihilation (â )<br />

Neutrons<br />

Scattering (E > 0.025 eV)<br />

Elastic (energy <strong>and</strong> momentum are conserved)<br />

Inelastic (photon emitted)<br />

Absorption (E < 0.025 eV)<br />

Radiative Capture (n, ã)<br />

Particle Emission (n, á) (n, p) (n, n)<br />

Fission (n, f)<br />

Gamma or X-ray photons<br />

Photoelectric Effect (generally < 1 MeV)<br />

Compton Scattering (generally 200 keV - 5 MeV)<br />

Pair Production (minimum 1.022 MeV)<br />

Scattered Photon<br />

T' = T / [1 + T(1 - cos è) / m0c 2]<br />

2<br />

where c = 931.5 MeV / amu<br />

Bremsstrahlung<br />

emitted energy is ~ 1/3 of the electron energy<br />

Photon Attenuation: I<br />

x<br />

= I0e µx<br />

Interaction Probability per gram:<br />

3 3<br />

Photoelectric Z / E<br />

Compton independent of Z<br />

Pair Production Z 1<br />

µ<br />

Total<br />

= µ<br />

pe<br />

+ µ<br />

cs<br />

+ µ<br />

cc<br />

W<br />

Air<br />

= 33.9 eV per ion pair<br />

Specific Ionization = S/W (i.p. / cm)<br />

Page 54<br />

RADIATION INTERACTIONS<br />

Charged Particles<br />

- +<br />

Ionization, Excitation, Bremsstrahlung (â ), Annihilation (â )<br />

Neutrons<br />

Scattering (E > 0.025 eV)<br />

Elastic (energy <strong>and</strong> momentum are conserved)<br />

Inelastic (photon emitted)<br />

Absorption (E < 0.025 eV)<br />

Radiative Capture (n, ã)<br />

Particle Emission (n, á) (n, p) (n, n)<br />

Fission (n, f)<br />

Gamma or X-ray photons<br />

Photoelectric Effect (generally < 1 MeV)<br />

Compton Scattering (generally 200 keV - 5 MeV)<br />

Pair Production (minimum 1.022 MeV)<br />

Scattered Photon<br />

T' = T / [1 + T(1 - cos è) / m0c 2]<br />

2<br />

where c = 931.5 MeV / amu<br />

Bremsstrahlung<br />

emitted energy is ~ 1/3 of the electron energy<br />

Photon Attenuation: I<br />

x<br />

= I0e µx<br />

Interaction Probability per gram:<br />

3 3<br />

Photoelectric Z / E<br />

Compton independent of Z<br />

Pair Production Z 1<br />

µ<br />

Total<br />

= µ<br />

pe<br />

+ µ<br />

cs<br />

+ µ<br />

cc<br />

W<br />

Air<br />

= 33.9 eV per ion pair<br />

Specific Ionization = S/W (i.p. / cm)<br />

Page 54<br />

RADIATION INTERACTIONS<br />

Charged Particles<br />

- +<br />

Ionization, Excitation, Bremsstrahlung (â ), Annihilation (â )<br />

Neutrons<br />

Scattering (E > 0.025 eV)<br />

Elastic (energy <strong>and</strong> momentum are conserved)<br />

Inelastic (photon emitted)<br />

Absorption (E < 0.025 eV)<br />

Radiative Capture (n, ã)<br />

Particle Emission (n, á) (n, p) (n, n)<br />

Fission (n, f)<br />

Gamma or X-ray photons<br />

Photoelectric Effect (generally < 1 MeV)<br />

Compton Scattering (generally 200 keV - 5 MeV)<br />

Pair Production (minimum 1.022 MeV)<br />

Scattered Photon<br />

T' = T / [1 + T(1 - cos è) / m0c 2]<br />

2<br />

where c = 931.5 MeV / amu<br />

Bremsstrahlung<br />

emitted energy is ~ 1/3 of the electron energy<br />

Photon Attenuation: I<br />

x<br />

= I0e µx<br />

Interaction Probability per gram:<br />

3 3<br />

Photoelectric Z / E<br />

Compton independent of Z<br />

Pair Production Z 1<br />

µ<br />

Total<br />

= µ<br />

pe<br />

+ µ<br />

cs<br />

+ µ<br />

cc<br />

W<br />

Air<br />

= 33.9 eV per ion pair<br />

Specific Ionization = S/W (i.p. / cm)<br />

Page 54

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!