SOLID STATE DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING AUGUST 31, 1958
The effect of 14-Mev neutron irradiation on the lifetime of current carriers and the conduction electron removal rate of germanium was investigated. Singlecrystal n- and p-type germanium plates were exposed to the 1.17 and 1.33 Mev gamma rays of Co/aup 60/. Radiation effects on the etching behavior of germanium was studied Magnetic susceptibility of manganese sesquioxide and unirradiated and neutron-irradiated n-type silicon was investigated. The introduction rate of deep traps in an originally 12 ohm-cm phosphorus -doped silicon sample is 1.1 x 10/sup -3/ levels per Co/sup 60/ photon per cm. The effects of neutron irradiation of InAs, quartz, and silica were investigated. The low-temperature thermal conductivity of lithium fluoride crystal after irradiation by thermal neutrons and Co/sup 60/ gamma rays was measured. The thermal couductivity of NaF and Csl crystals was measured. The release of stored energy of graphite tanken from the lattice of the ORNL Graphite Reactor was measured. A study of the amplitude-independent internal fricton and Young's modulus in copper from 14 K to room temperature, both before and after neutron irradiation, was made. The temperature dependence of the critical shear stress of a neutron irradiated single copper crystal was measured. Isochronal annealing studies were made on high-purity Be and Mg neutron irradiated at 19.5 K. An investigation was made of the polygonization of copper by using etch pits and x- ray diffraction to observe polygonization. The possibility of measuring the rate of deuterinm diffusion in copper was investigated. Electrical resistivity measurements on Al-Cu alloys are described. Mechanical yielding at 78 and 300 K in unirradiated and fast neutron irradiated copper single crystals was studied. The behavior of irradiated iron alloys is discussed. The stress-rupture life of tubeburst specimens of Inconel in air was determined in the MTR at several stresses at 1500 F. The Np/sup 237/ and U/sup 238/ fission reactions and the S (n,p)P reaction are compared as relative monitors for radiation damage effects caused by displacements. The reactor and gamma irradiation of polymers are compared. The effect of molecular orientation on cross-linking or scission by radiation in amorphous polymers was investigated. A technique is described for measuring the temperature coefficient of the Young's modulus of ceramic specimens. Energy absorption in graphite and a hydrogen containing material was measured with a small calorimeter in the ORNL Graphite Reactor. Fission gas evolution was measured from U0/sub 2/ of 96% theoretical density irradiated at 1700 , and the rate was found to be of the order of 1% of the production rate. A U0/sub 2/ fuel plate clad with Cr-A10/sub 3/ was examined after irradiation at 1800 C to 14.5% U/sup 235/ burnup. A study of volatitity behavior of Mo indicates that MoF/ sub 5/ is convented to MoF/sub 6/ by fluorine. MoF/sub 6/ and Tc are absorbed on NaF at lOO C, TcF being more strongly adsorbed than MoF/sub 6/. The Inconel in-pile forced-circulation fused salt loop operated for 235 hr at 1600 F in the LITR was examined for corrosion. Investigation of the holdup or retention of gaseous fission products was continued. (For preceding period see ORNL-2413.) (W.D.M.)
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-13-002275
- OSTI ID:
- 4295201
- Report Number(s):
- ORNL-2614
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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