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Title: Deuteron irradiation of W and WO 3 for production of high specific activity 186Re: Challenges associated with thick target preparation

This investigation evaluated target fabrication and beam parameters for scale-up production of high specific activity 186Re using deuteron irradiation of enriched 186W via the 186W(d,2n) 186Re reaction. Thick W and WO 3 targets were prepared, characterized and evaluated in deuteron irradiations. Full-thickness targets, as determined using SRIM, were prepared by uniaxi-ally pressing powdered natural abundance W and WO 3, or 96.86% enriched 186W, into Al target supports. Alternatively, thick targets were prepared by pressing 186W between two layers of graphite powder or by placing pre-sintered (1105°C, 12 hours) natural abundance WO 3 pellets into an Al target support. Assessments of structural integrity were made on each target pre-pared. Prior to irradiation, material composition analyses were conducted using SEM, XRD, and Raman spectroscopy. With-in a minimum of 24 hours post irradiation, gamma-ray spectroscopy was performed on all targets to assess production yields and radionuclidic byproducts. Problems were encountered with the structural integrity of some pressed W and WO 3 pellets before and during irradiation, and target material characterization results could be correlated with the structural integrity of the pressed target pellets. Under the conditions studied, the findings suggest that all WO 3 targets prepared and studied were unacceptable. By contrast, 186Wmore » metal was found to be a viable target material for 186Re production. Lastly, thick targets prepared with powdered 186W pressed between layers of graphite provided a particularly robust target configuration.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [3] ;  [5] ;  [6] ;  [7] ;  [8] ;  [1]
  1. Univ. of Washington, Seattle, WA (United States). Dept. of Radiation Oncology
  2. Univ. of Washington, Seattle, WA (United States). Dept. of Radiation Oncology; Univ. of Alberta, Edmonton, AB (Canada). Cross Cancer Inst., Dept. of Oncology
  3. Univ. of Washington, Seattle, WA (United States). Dept. of Materials Science and Engineering
  4. Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.; Univ. of Missouri Research Reactor Center, Columbia, MO (United States)
  7. Univ. of Missouri Research Reactor Center, Columbia, MO (United States)
  8. Univ. of Missouri, Columbia, MO (United States). of Chemistry
Publication Date:
Report Number(s):
BNL-113242-2016-JA
Journal ID: ISSN 0969-8043; R&D Project: KBCH139; KB0202011; TRN: US1701816
Grant/Contract Number:
SC0012704; SC0007348
Type:
Accepted Manuscript
Journal Name:
Applied Radiation and Isotopes
Additional Journal Information:
Journal Volume: 115; Journal Issue: C; Journal ID: ISSN 0969-8043
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ¹⁸⁶Re production; Pressed targets; W and WO₃ thick targets; Deuteron induced reaction; High specific activity
OSTI Identifier:
1338598
Alternate Identifier(s):
OSTI ID: 1358798