Progress is reported by the Mechanical Development group and by the Plant Assistance group. The Mechanical Development group reports on the thimble removal program, special pile measurements and instruments, graphite sampling, and the ruptured slug problem. The Plant Assistance group reports on technical information on the B, D, F, and H piles, special request container slug, exposure of P-10 fuel slugs, slug corrosion studies, front tube corrosion, and flow laboratory experiments.

Hanford fuel elements are made by brazing uranium cores in aluminum cans. The interface, or junction, between the AlSi braze and uranium core known as the compound layer, is composed of an intermetallic complex. The properties of this compound layer, brittleness, ductility, toughness, are considered to have a pronounced influence on the performance of fuel elements in the reactors. This report presents the results of initial efforts to identify the compound layers and establish some of the process conditions and variables which influence the properties of the compound layer, in particular, the lead preheat time.

This is a progress report of the production reactors on the Hanford Reservation for the month of July 1950. This report takes each division (e.g., manufacturing, medical, accounting, occupational safety, security, reactor operations, etc.) of the site and summarizes its accomplishments and employee relations for that month.

A resume of Health Physics activities for April, May, and June, 1959 is presented. Discussions and tabulations which summarize results of field surveys, biooassy, personnel monitoring, and environmental surveys are included. The thorium redrumming program reactivated for the summer. Work is in progress to move th "HH" Building process to the "T" Building. The ventilation system for the Hot Gas Facility was extended to handle the ventilation requirements for tthe R-108 Surveillance facility. "Hot" work in R-108 began in June. During this quarter "hot" work was initiated in the new Plutonium Alloy Research facility. Health Physics design criteria for the proposed Clover facility has been submitted to the Engineeering Department. The installation of the air monitoring systems in the new Cryogenics facility and iin the new Ceramics facility is essentially complete. We have embarked on the program of converting all of our personnel monitoring and survey record keeping systems to the IBM system.

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S>Portions of two samples of HRT fael solutions were sealed in silica capillary tubes approximately three weeks after they were removed from the reactor and the temperature at which each solution separated into two liquid layers was determined. The values found, 325 er inch per 1 C for one sample and 326 er inch per 1/2 C for the other, are slightly lower than predicted from experiments with synthetic fuel solutions (329--330 C) but the discrepancies are small enough so that they could be accounted for by the minor differences in composition between the synthetic and reactor fuel solutions. There appears to be little reason to believe that the high radiation level which the fuel- solution is exposed to in the reactor has a significant effect on its phase behavior, at least after it has cooled to 2r per ml. Dilution of fuel solution wvith 8 vol.% of 30% H/sub 2/O/sub 2/ and with the same amount of H/sub 2/O increased the two-liquid phase formation temperature about 2 EC but increasing the free D/sub 2/SO/sub 2/ concentration from about 0.017 to 0.04 M raised the immiscibility temperature 19 to 345 C. (auth)

Three independent measurements of the work function of uranium have been reported. The values obtained were were made with uranium wire and since, as shown by the authors, uranium is very readily oxidized at pressures of 10/sup -7/ mm Hg to give a relatively non-volatile oxide, one surmises that some of these determinations were subject to error because of vacuum conditions. Attempting to investigate the validity of this criticism, the authors have measured the thermionic properties of a uranium wire in such a manner that some information regarding the cleanliness of the surface can be deduced. The two types of measuremente accomplished were the change in the thermionic constants of the Richardson equation with time of heating in hydrogen, and the dependence of current on the retarding potential. (auth)

Helicity amplitudes are written for photoproduction of mesons and related in the amplitudes of Chew, Goldberger, Low, and Nambu. The expansions of both types of amplitudes in terms of amplitudes for particular angularmomentum states are then inverted. (auth)

A 48-in.-long liquid-hydrogen target is described. The operating characteristics of the target and its safety features which follow the regulations laid down by the Hydrogen Safety Committee of the Lawrence Radiation Laboratory are stressed. (auth)

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