| Energy Deposition Fluctuations Induced by Ions in Microvolumes and Nanovolumes - An Analytic Approach. 1. Theory |
22 JUL 93 |
66 pages |
| Authors:
Michael A. Xapsos; Edward A. Burke; Geoffrey P. Summers; NAVAL RESEARCH LAB WASHINGTON DC
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 | A new analytic method is developed for calculating fluctuations in energy deposition induced by ions in sites having dimensions as small as one nanometer. The method considers two contributions to the fluctuation phenomena. The first is due to direct ion interactions with the site. The second is due to secondary electrons that strike the site but which are produced by ion interactions in the surrounding medium. Particular attention is given ... |
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| Dosimetry for Microelectronics |
01 MAY 91 |
96 pages |
| Authors:
Edward A. Burke; MISSION RESEARCH CORP NASHUA NH
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| Existing information on the dose enhancement effect is reviewed and current problems identified. Possible solutions are outlined. In addition, the design and use of a dual cavity ionization chamber for routine measurement of dose enhancement factors in cobalt-60 gamma test facilities is described. The enhancement factors can be derived directly from the chamber measurements without recourse to reference data that may be difficult to obtain. This relatively simple device reliably ... |
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| Ionizing Noise in Infrared Sensors. |
13 DEC 1973 |
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| Authors:
Virgil E. Vickers; Freeman D. Shepherd Jr.; Edward A. Burke; AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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 | A model is described for the effects of gamma-induced ionizing noise in infrared sensors, taking into account the incident gamma spectrum, both Compton events in the detector and secondary hot electrons from the metal surroundings, partial or total deposition of the initial hot electron energy, detector geometry, and preamplifier impulse response. The model as coded gives predicted pulse height distributions and, for threshold-gating type circumvention, predicted duty cycles; it indicates ... |
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| CORE POLARIZATION EFFECT IN HYPERFINE STRUCTURE. |
1970 |
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| Authors:
Edward A. Burke; ADELPHI UNIV GARDEN CITY NY
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| A two-determinant approximation which allows for correlation via exchange between all s-electrons and the valence electrons is the subject of this summary. Three general methods were tried: (a) analytic Slater-type orbitals applied to ground state of boron, (b) analytic Hylleraas-type orbitals applied to ground state of beryllium and (c) numerical orbitals applied to the ground state of lithium. (Author) |
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| THE POWER LAW AND CONSTANT LOSS MODELS IN SECONDARY ELECTRON EMISSION. |
OCT 1966 |
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| Authors:
Peter D. Gianino; Edward A. Burke; AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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| There is evidence that the low-energy component of secondary emission from metals under relativistic electron bombardment can be predicted using experimental data obtained under low-energy irradiation. This greatly enhances the motivation for establishing a model applicable to low-energy bombardment which can reliably predict the behavior of all necessary quantities. Two phenomenological models - namely, the Power Law (P.L.) and the Constant Loss (C. L.) assumptions - have already been employed ... |
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| CALCULATED CROSS SECTIONS FOR ATOMIC DISPLACEMENTS PRODUCED BY ELECTRONS IN THE 1.03-3.0 MEV ENERGY RANGE. |
APR 1965 |
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| Authors:
Edward A. Burke; Neil J. Grossbard; Lester F. Lowe; AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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| In deriving atomic displacement threshold energies from electron bombardment data it is necessary to employ numerical values of the electron scattering cross section calculated over a range of electron energies. For relativistic energies the MottRutherford cross-section formula may be used. A computer program was developed to evaluate this formula for any value of atomic number and electron energy. The program is described and numerical values presented for atomic numbers 23, ... |
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| THE FERROUS-FERRIC DOSIMETER: A REVIEW, |
DEC 1963 |
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| Authors:
Edward A. Burke; AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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| The characteristics, preparation, and use of the ferrous-ferric dosimeter are reviewed in detail. This includes a discussion of the dose range, dose rate dependence, energy dependence, and temperature effects. For photons with energies in excess of 6 kev the irradiation yield may be represented by the expression G = 15.61 - 15.43/E, where E is the mean photon energy in kev and G is the number of ferrous ions oxidized ... |
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