SELF-DIFFUSION IN SINGLE-CRYSTAL TUNGSTEN AND DIFFUSION OF RHENIUM TRACER IN SINGLE-CRYSTAL TUNGSTEN

Technical Report · Fri Mar 01 04:00:00 EST 1963

OSTI ID:4714039

Andelin, R L

Self-diffusion in single-crystal W, and diffusion of Re tracer in single- crystal W were measured at 2660 to 3230 un. Concent 85% C ue. The initial radioactive oduced on the diffusion samples by bombardment with 9.0-Mev, deuterons. It was shown that the initial radioactive layer satisfactorily approximated the boundary-condition requirements of the onedimensional diffusion equation. The tracers observed in determining the diffusion coefficients were W/ sup 185/, Re/sup 183/, and Re/sup 184/. In the process of determining an optimum deuteron fusion samples, total cross sections as a function of deuteron energy were measured for the reactions W/sup 184/(d,p)W/sup 185/, W/sup 186/(d,p)W/sup 187/, and W/sup 184/ (d,2n)Re/sup 184/ by the stacked-foil technique. Cross- section values for the reactions leading to the production of both W/sup 195/ and W/sup 187/ increased from about 3 mb at 6 Mev to a fairly- broad maximum of 300 mb between 11 and 13 Mev. Cross sections for production of 34-day Re/sup 184/ range from about 3 to 380 mb for deuterons with energies ranging from 7 to 14 Mev. Deuteron energies employed (14-Mev maximum) were not high enough to indicate the position of the maximum for the W/sup 184/(d,2n)Re/sup 184/ excitation function. The decay of W/sup 185/ was observed over a period of about 9 half lives, and a new half-life value of 75.14 450 deg C in a 0.63 days, with the uncertainty expressed to 3 re p-terphenyl , was obtained. The halflife value obtained for W was 23.72 450 deg C in a 0.06 hours. (auth)

• Research Organization: Los Alamos Scientific Lab., N. Mex.
• DOE Contract Number: W-7405-ENG-36
• NSA Number: NSA-17-022165
• OSTI ID: 4714039
• Report Number(s): LA-2880
• Country of Publication: United States
• Language: English

Related Subjects

ACTIVATION
BOUNDARY CONDITIONS
CROSS SECTIONS
DECAY
DEUTERON BEAMS
DIFFUSION
EQUATIONS
EXCITATION
FOILS
HALF-LIFE
LAYERS
MATHEMATICS
METALS, CERAMICS, AND OTHER MATERIALS
MONOCRYSTALS
RADIOACTIVITY
RHENIUM
RHENIUM 183
RHENIUM 184
TEMPERATURE
TRACER TECHNIQUES
TUNGSTEN
TUNGSTEN 184
TUNGSTEN 185
TUNGSTEN 186
TUNGSTEN 187