SOME RESEARCH APPLICATIONS OF RADIOISOTOPE TECHNIQUES AT NCEL
Abstract
Specific applications of radioisotope techniques in three areas were studied and evaluated. The areas include measurements of the diffusion of isotopically labeled water in concrete; the measurement of small distortions in a hollow sphere; and the measurement of film thicknesses, both liquid and solid, when covering other materials. The preferred technique for the study of the migration of water in concrete involves the introduction of heavy water (D20) into a concrete specimen and the measurement of its concentration at some later time by sectioning the specimen, extracting the water, and measuring the concentration of heavy water therein with a mass spectrometer. The second study indicates the feasibility of measuring the internal distortions of a hollow concrete sphere to within 0.001 inch by observing variations in counting rate with variations in separation between a source of alpha radiation and a detector installed on opposite sides of the cavity. The final investigation is concerned with the measurement of thin films, either of liquids as in a thin-film heat exchanger, or of solids such as protective coatings. The preferred method is based on the selective backscattering of beta rays from the materials under study.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 30, 1965
- Accession Number
- AD0684472
Entities
People
- Henry E. Stanton
Organizations
- Naval Facilities Engineering Service Center