| Paper |
Title |
Page |
| RPAP035 |
Photonuclear and Radiation Effects Testing with a Refurbished 20 MeV Medical Electron Linac
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2363 |
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- T. Webb, L.C. DeVeaux, F. Harmon, J.E. Petrisko, R.J. Spaulding
IAC, Pocatello
- R. Assink
Sandia National Laboratories, Albuquerque, New Mexico
- W. Beezhold
ISU, Pocatello, Idaho
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An S-band 20 MeV electron linear accelerator formerly used for medical applications has been recommissioned to provide a wide range of photonuclear activation studies as well as various radiation effects on biological and microelectronic systems. Four radiation effect applications involving the electron/photon beams are described. Photonuclear activation of a stable isotope of oxygen provides an active means of characterizing polymer degradation. Biological irradiations of microorganisms including bacteria were used to study total dose and dose rate effects on survivability and the adaptation of these organisms to repeated exposures. Microelectronic devices including bipolar junction transistors (BJTs) and diodes were irradiated to study photocurrent from these devices as a function of peak dose rate with comparisons to computer modeling results. In addition, the 20 MeV linac may easily be converted to a medium energy neutron source which has been used to study neutron damage effects on transistors.
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| RPAP021 |
A Portable Electron Radiography System
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1715 |
| |
- F.E. Merrill, C.L. Morris
LANL, Los Alamos, New Mexico
- K. Folkman, F. Harmon, A.W. Hunt, B. King
ISU, Pocatello, Idaho
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The technique of charged particle radiography has been developed and proven with 800 MeV protons at LANSCE and 24 GeV protons at the AGS. Recent work at Los Alamos National Laboratory in collaboration with the Idaho Accelerator Center has extended this diagnostic technique to electron radiography through the development of an inexpensive and portable electron radiography system. This system has been designed to use 30 MeV electrons to radiograph thin static and dynamic systems. The system consists of a compact 30 MeV pulsed electron linear accelerator coupled to a quadrupole lens magnifier constructed from permanent magnet quadrupoles. The design features and operational characteristics of this radiography system are presented as well as the radiographic performance parameters.
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