Materials prepared at the Institute for Reference Materials and Measurements (IRMM) for reactor dosimetry applications

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:55591

Ingelbrecht, C D; Peetermans, F W; Palmeri, S; Robouch, P B ^[1]

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1. Inst. for Reference Materials and Measurements, Geel (Belgium). Sample Preparation Group

Thirteen reference materials prepared under the Euratom Working Group on Reactor Dosimetry (EWGRD) monitor materials program are now available. The determination of trace impurities has recently been completed for rhodium metal (iridium 26.0 {+-} 0.6 mg{center_dot}kg{sup {minus}1}, platinum < 5 mg{center_dot}kg{sup {minus}1}) and these values will be proposed for certification. Certification analyses of titanium metal, which are continuing, indicate scandium < 0.1 mg{center_dot}kg{sup {minus}1}. The preparation of alloys for neutron fluence rate measurements are discussed. Satisfactory homogeneity in aluminum alloys can be difficult to achieve on a milligram scale due to the formation of coarse intermetallic particles, and suitable processing with a high solidification rate, cold working and annealing is essential. The example is given of the alloys Al-15 wt% U and Al-14 wt% Pu, where the inhomogeneity (in terms of relative standard deviation of alloying element) was determined by isotope dilution mass spectrometry as < 0.2% in each case for 20 mg samples. Some recent examples of dosimeter encapsulation are given including NpO{sub 2} and UO{sub 2} microspheres in high purity vanadium and Al-Pu and Al-U fission foils in cold-pressed aluminum containers.

• OSTI ID: 55591
• Report Number(s): CONF-930809--; ISBN 0-8031-1899-6
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ALUMINIUM BASE ALLOYS
CALIBRATION STANDARDS
DOSEMETERS
NEPTUNIUM OXIDES
NEUTRON DOSIMETRY
PLUTONIUM ALLOYS
URANIUM ALLOYS
URANIUM DIOXIDE