Improved fabrication of HgI/sub 2/ nuclear radiation detectors by machine-cleaving

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The perfection of machine-cleaved sections from HgI/sub 2/ bulk crystals was examined. The perfection of the machine-cleaved sections as established by gamma diffraction rocking curves was found to be much better than the perfection of hand-cleaved sections or as grown thin platelets, reaching a perfection similar to that of the wire-sawn sections of HgI/sub 2/. A correlation between the perfection and the thickness of the machine-cleaved section was also found, i.e., the thicker the cleaved-section the more perfect it is. The reproducibility of the fabrication was significantly improved by using machine cleaving in the process of fabrication. Large single crystals ... continued below

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Pages: 8

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Levi, A.; Burger, A.; Schieber, M.; Vandenberg, L.; Yellon, W.B. & Alkire, R.W. January 1, 1982.

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The perfection of machine-cleaved sections from HgI/sub 2/ bulk crystals was examined. The perfection of the machine-cleaved sections as established by gamma diffraction rocking curves was found to be much better than the perfection of hand-cleaved sections or as grown thin platelets, reaching a perfection similar to that of the wire-sawn sections of HgI/sub 2/. A correlation between the perfection and the thickness of the machine-cleaved section was also found, i.e., the thicker the cleaved-section the more perfect it is. The reproducibility of the fabrication was significantly improved by using machine cleaving in the process of fabrication. Large single crystals of HgI/sub 2/ weighing 20 to 200 g, can be grown from the vapor phase using the TOM Technique. In order to fabricate nuclear radiation detectors from these single crystals, thin sections of about 0.4 to 0.8 mm thickness have to be prepared. Up till now, the state-of-the-art of fabricating HgI/sub 2/ nuclear radiation detectors involved two methods to get thin sections from the large single crystals: (1) hand-cleaving using a razor-blade and (2) solution wire sawing. The chemical wire sawing method involves a loss of about 50% of the crystal volume and is usually followed by a chemical polishing process which involves a significant loss of volume of the original volume. This procedure is complicated and wasteful. The traditional fabrication method, i.e., hand-cleaving followed by rapid nonselective chemical etching, is simpler and less wasteful.

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Pages: 8

Notes

NTIS, PC A02/MF A01.

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  • 5. international workshop on HgI/sub 2/ nuclear radiation detectors, Jerusalem, Israel, 6 Jun 1982

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  • Other: DE82017674
  • Report No.: CONF-820667-2
  • Grant Number: AC08-76NV01183
  • Office of Scientific & Technical Information Report Number: 5309750
  • Archival Resource Key: ark:/67531/metadc1064718

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1982

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 29, 2018, 12:56 p.m.

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Levi, A.; Burger, A.; Schieber, M.; Vandenberg, L.; Yellon, W.B. & Alkire, R.W. Improved fabrication of HgI/sub 2/ nuclear radiation detectors by machine-cleaving, article, January 1, 1982; United States. (digital.library.unt.edu/ark:/67531/metadc1064718/: accessed July 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.