- electron/proton penetration depth


electron/proton penetration depth -

Penetration Depth of Energetic Incident Electrons in Materials - Practical Electron Microscopy and Database - - An Online Book -. The high energy electrons, typically 100 – 300 keV, in a transmission electron microscope (TEM) can pass completely through a specimen at thicknesses below ~ 1μm. Because of the limit of specimen penetration, the effectively observable thickness increases ~3 to 10 . Electron emitters like Strontium 90 or Phosphorus 32 emit electrons with a broad range of energies. This means the penetration of the electrons is a jumble of different electron curves, all of which would individually look like the curve in figure 3. The penetration of electrons from real Strontium 90 and sources are shown in figure 4.

TECHNICAL MEMORANDUM X-53063 THE CALCULATION OF PROTON PENETRATION AND DOSE RATES by Martin 0. Burrell George C. Marshall Space Flight Center Huntsville, Alabama ABSTRACT Computational methods are developed.to determine the proton energy degradation and flux attenuation as a function of penetration depth in various rra terials. Depth (cm) Dose (MeV/cm) W = 0.1 cm W = 0.16 cm W = 0.24 cm W = 0.5 cm W = 1 cm W = 2 cm. Depth dose for 160 MeV Protons for various field sizes. For small fields, loss of in-scattering (charged particle equilibrium) results in deterioration of Bragg peak and non uniformity of SOBP.

Abstract: The average depth of electron penetration is introduced as the physical quantity useful in electron beam irradiation. It is defined as the average of the maximum depths on the trajectories of electrons passing through finite, semi-infinite or infinite medium.Cited by: 13. The penetration range R50 for electron can be defined as the distance at which the radial dose function drops to a value of 50% of its maximum value. The R50 increased with increasing electron energy, and had values of 1.46, 3.62, 5.89, and 8.21 mm for 0.5, 1.0, 1.5, and 2.0 MeV.Cited by: 30.