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Full-Text Articles in Physics
Energy Deposition By Electron Beams And Δ Rays, E. J. Kobetich, Robert Katz
Energy Deposition By Electron Beams And Δ Rays, E. J. Kobetich, Robert Katz
Robert Katz Publications
The product of two empirical relations, for the practical range and the transmission probability of normally incident electrons through plane sheets of matter, may be differentiated to yield a simple formulation of the energy deposition by electron beams, in agreement with more complex formulations and with experimental data. When combined with the δ-ray distribution formula, these results provide a theory of the spatial distribution of ionization energy about the path of a rapidly moving ion, which is basic to theories of radiation damage and detection.
Formation Of Etchable Tracks In Dielectrics, Robert Katz, E. J. Kobetich
Formation Of Etchable Tracks In Dielectrics, Robert Katz, E. J. Kobetich
Robert Katz Publications
It is proposed that etchable damage is produced in dielectrics by energetic charged particles when a critical dosage of ionization energy is deposited at a critical distance from the ion's path by secondary electrons. Within the critical cylinder, molecular fragments more soluble than the parent molecule are formed. The radius of the critical cylinder is taken to be approximately 20 Å, as is appropriate to the passage of the etchant along the track and the diffusion of reaction products back to the surface. At the critical radius the dosage approximates doses producing bulk damage under γ irradiation. The proposed criterion …
Response Of Nai(T1) To Energetic Heavy Ions, Robert Katz, E. J. Kobetich
Response Of Nai(T1) To Energetic Heavy Ions, Robert Katz, E. J. Kobetich
Robert Katz Publications
Experimental values of the relative heights of scintillation pulses generated in NaI(T1) crystals, by heavy ions (Z>5) of energy 1-10 MeV/amu, agree well with computed relative cross sections for photon production, from a theory based on the assumption of a one-hit response to the spatially distributed dose of ionization energy, and a characteristic dose of 4x107 erg/cm3 for this material Discrepancies between theory and experiment for He bombardments arise from the theoretical neglect of the nonlinear dose variation over the sensitive volume surrounding each TI atom. Similar discrepancies arising from the neglect of molecular volume occur …
Width Of Heavy-Ion Tracks In Emulsion, E. J. Kobetich, Robert Katz
Width Of Heavy-Ion Tracks In Emulsion, E. J. Kobetich, Robert Katz
Robert Katz Publications
Profiles of the solid core of long, flat, ending tracks of heavy primary cosmic rays in Ilford G-5 emulsion have been measured by manually tracing their enlarged (3500X) photographic image. These measurements agree well in the ending 3000 μ of residual range (β <0.3) with a reformulated theory of track width based on computation of the spatial distribution of ionization energy. The measured core width in G-5 emulsion is the sum of the sensitized cylinder diameter, at which 6000 erg/cm3 of ionization energy is deposited by δ rays, and the diameter of a developed grain.