Ultrasonic examination of thin iridium hemispheres for the multihundred watt heat source
Description
An ultrasonic method was developed for nondestructive inspection of the structural integrity of the 20-mil (0.0508-cm) thick iridium hemispheres that are used in the fabrication of Multihundred Watt (MHW) radioisotopic heat sources. A hemisphere was considered unacceptable if a back-surface ultrasonic response change was equivalent to that obtained from a 0.010-in. (0.0254-cm) diameter flat-bottomed hole in the standard. Flaws were detected in hemispheres made by the initial fabrication process. Typical flaws found ultrasonically in these units and revealed by metallography are shown. Hemispheres formed after a change to a different fabrication process were free of flaws
Availability note (English)
MF available from INIS under the Report Number; Available from NTIS.
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Additional details
Publishing Information
- Imprint Pagination
- 14 p.
- Report number
- MLM--2291
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 7255849
- Subject category
- S07: ISOTOPES AND RADIATION SOURCES;
- Descriptors DEI
- CAPSULES; IRIDIUM; PLUTONIUM DIOXIDE; PLUTONIUM 238; RADIOISOTOPE HEAT SOURCES; THERMOELECTRIC GENERATORS; ULTRASONIC TESTING
- Descriptors DEC
- ACOUSTIC TESTING; ACTINIDE COMPOUNDS; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; CHALCOGENIDES; CONTAINERS; DIRECT ENERGY CONVERTERS; ELEMENTS; EVEN-EVEN NUCLEI; HEAVY NUCLEI; ISOTOPES; MATERIALS TESTING; METALS; NONDESTRUCTIVE TESTING; NUCLEI; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; PLUTONIUM COMPOUNDS; PLUTONIUM ISOTOPES; PLUTONIUM OXIDES; RADIOISOTOPES; TESTING; TRANSITION ELEMENTS; TRANSURANIUM COMPOUNDS; YEARS LIVING RADIOISOTOPES
Optional Information
- Notes
- Available from NTIS. $4.00.