rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Novel studies in x-ray emission analysis using radioisotopes
  name:
    name part: Joyce, John Randal
    name part: 1954-
    role:
      role term: creator
  name:
    name part: Moyer, Vance E.
    role:
      role term: degree committee member.
  name:
    name part: Rowe, Marvin W.
    role:
      role term: degree committee member.
  name:
    name part: Schweikert, Emile A.
    role:
      role term: degree supervisor.
  name:
    name part: Young, Vaneica
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1983
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: ix, 95 leaves : illustrations ; 29 cm
  abstract: Two novel techniques employing radioisotopes for x-ray emission were studied: internal x-ray emission analysis and low energy proton activation with counting of radioactive x-ray emitters. An inexpensive, sensitive technique for the analysis of a broad range of elements (Z 16 through 47 were studied) was developed by implanting radioisotopes (('3)H, ('35)S, ('63)Ni, ('75)Se, ('91)Tc, ('125)I, ('195)Au) into a sample. These radioisotopes decay by x-ray or (beta)('-) emission which in turn excites characteristic x-rays from elements in the sample. The application of this technique to trace analysis was demonstrated with a multielement standard sample containing 0.1% of Ag, Ni, Cr, Zn, Co, Rb, Sc, Br, Mo, and As. Limits of detection varied with the radioisotope and its specific activity, ranging from 470 ppm Br with 0.74 MBq (.) g('-1) (20 (mu)Ci) ('35)S to 20 ppm Ag with 74 kBq (.) g('-1) (2 (mu)Ci) ('125)I. These limits are less than with conventional external radioisotope excited x-ray systems. For example, with a 74 kBq internal ('125)I source a limit of detection of 52 ppm is obtained for Ge vs. a 70 ppm value obtained with a 4 MBq (100 (mu)Ci) external ('109)Cd source. Low energy proton radioactivation (3.6-6 MeV) with subsequent nondispersive x-ray counting was evaluated for trace analysis. Thick target yields and interference-free detection limits were measured for 15 isotopes (('37)Cl, ('49)Ti, ('51)V, ('57)Fe, ('65)Cu, ('67)Zn, ('71)Ga, ('73)Ge, ('75)As, ('85)Rb, ('88)Sr, ('89)Y, ('92)Zr, ('95)Mo, and ('105)Pd) with 5 MeV yields ranging from 1.26 E-4 cpm/(mu)g for Fe to 1.86 E-1 cpm/(mu)g for Ga and limits of detection ranging from 1.33 E-1 (mu)g Fe and 9.18 E-3 (mu)g Ga. This technique was applied for the determination of V and Ga in NBS glasses doped at the 500 and 50 ppm level (measured values were 431 (+OR-) 21 and 45 (+OR-) 11 ppm for Ga, and 494 (+OR-) 54 and 42 (+OR-) 4 ppm for V, respectively). Elemental mapping was accomplished by autoradiography. Da…
  note: "Major subject: Chemistry."
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. in Philosophy Texas A & M University 1983
  note: Includes bibliographical references (leaves 53-55).
  subject:
    topic: Nuclear activation analysis
  subject:
    topic: Radioisotopes
  subject:
    topic: X-rays
  subject:
    topic: Chemistry
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-548552
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-548552
  record info:
    record content source: TXA
    record creation date: 841024
    record change date: 20220103135131.0
    record identifier: in00000538568
    language of cataloging:
      language term: eng