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Effects of irradiation on thorium and thorium-uranium alloys

Author: J H Kittel; Argonne National Laboratory.
Publisher: Argonne, Ill. : Argonne National Laboratory, 1963.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
Three separate irradiation experiments were completed with Th and Th--U alloys. In the first experiment, threerolled plates of Th and Th--5 wt% U alloy irradiated to total atom burnups up to 1.5% at 200 deg C showed no anisotropic growth and decreased in density at a rate of 1% per at.% burnup. In the second experiment, 15 swaged specimens of Th and of the alloys Th--0.1 wt% U, Th--1.4 wt% U, and Th--5.5 wt% U were  Read more...
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Additional Physical Format: Print version:
Kittel, J.H.
Effects of irradiation on thorium and thorium-uranium alloys.
Argonne, Ill. : Argonne National Laboratory, 1963
(OCoLC)61822558
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: J H Kittel; Argonne National Laboratory.
OCLC Number: 609294221
Reproduction Notes: Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010. MiAaHDL
Description: 1 online resource (35 pages) : illustrations
Details: Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.
Responsibility: by J.H. Kittel [and others].

Abstract:

Three separate irradiation experiments were completed with Th and Th--U alloys. In the first experiment, threerolled plates of Th and Th--5 wt% U alloy irradiated to total atom burnups up to 1.5% at 200 deg C showed no anisotropic growth and decreased in density at a rate of 1% per at.% burnup. In the second experiment, 15 swaged specimens of Th and of the alloys Th--0.1 wt% U, Th--1.4 wt% U, and Th--5.5 wt% U were irradiated to burnups ranging from 0.3 to 3.6% of all atoms at temperatures in the range of 45 to 200 deg C. Again, no anisotropic growth was observed and densities decreased at rates near 1% per at.% burnup. A Th--1.4 wt% U alloy specimen with 2.0 at.% burnup was found to have retained significant room-temperature ductility. In the final experiment, a group of 44 chill-cast specimens of Th alloys containing 10, 15, 20, 25, and 31 wt% U were irradiated to burnups ranging from 0.16 to 10.1% of all atoms. Maximum irradiation temperatures ranged from 260 to over 1000 deg C. Surface roughening occurred in the alloys cortaining 25 and 31 wt% U. Volume increases at any given temperature for all alloys were linear with increasing burnup. The rate of volume increase for all alloys rose from approximately 1% per at.% burnup at the lower temperatures to a value of 2.5 at 650 deg C. Thereafter the swelling rate increased somewhat, reaching a value of 6% volume increase per at.% burnup at 800 deg C. The rates of volume increase under irradiation of Th--U alloys in the entire temperature range studied were significantly less than those reported for the best U-base alloys. It is suggested that the excellent resistance to high- temperature swelling of the cast Th--U alloys resulted from the fact that a dispersion of very thin U particles was obtained. A high probability, therefore, existed for fission recoils to escape from the U particles into the isotropic and less densely packed Th matrix. (auth).

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