Radiation Interactions - Panasonic PT-DZ12000U Operating Instructions Manual

Charged Particles
Ionization, Excitation, Bremsstrahlung (â ), Annihilation (â )
Neutrons
Scattering (E > 0.025 eV)
Elastic (energy and momentum are conserved)
Inelastic (photon emitted)
Absorption (E < 0.025 eV)
Radiative Capture (n, ã)
Particle Emission (n, á) (n, p) (n, n)
Fission (n, f)
Gamma or X-ray photons
Photoelectric Effect (generally < 1 MeV)
Compton Scattering (generally 200 keV - 5 MeV)
Pair Production (minimum 1.022 MeV)
Scattered Photon
T' = T / [1 + T(1 - cos è) / m c ]
2
where c = 931.5 MeV / amu
Bremsstrahlung
emitted energy is ~ 1/3 of the electron energy
Photon Attenuation: I = I e
Interaction Probability per gram:
Photoelectric
Compton independent of Z
Pair Production
µ =
Total
W =
Air
Specific Ionization

RADIATION INTERACTIONS

x
3
Z / E
Z
µ + µ + µ
pe cs
33.9 eV per ion pair
= S/W (i.p. / cm)
0 2
µx
0
3
1
cc
52
- +