This report details events of importance reported by the Hanford Operation Office for the week ending February 2, 1949.

This report details events of importance reported by the Hanford Operations Office for the week ending April 6, 1949.

Minutes of conferences held at Chalk River, Ontario. The subjects discussed related primarily to separations processes.

This is the progress report for the University of California, Radiation Laboratory for December 15, 1948-January 15, 1949. It discusses the following: (1) Bevatron; (2) 184-inch Cyclotron Program; (3) 60-inch Cyclotron Program; (4) Synchrotron Operation; (5) Linear Accelerator and Van de Graaff Operation; (6) Experimental Physics; (7) Theoretical Physics, (8) Isotope Separation; (9) Chemistry Departments; (10) Medical Physics; and (11) Health Physics and Chemistry.

This report provides information on reactivity, temperature coefficients and energy storage to the Reactor Safeguard Committee with regard to contemplated increases in power levels.

Many questions have been raised concerning the advisability of continuing the presently scheduled Redox design and construction program in performance to other uranium recovery processes. In order to answer these questions properly, an extensive re-examination of the Redox process objectives and status and a careful study of other possible alternative uranium recovery processes have been carried out by the Hanford Works. This survey has included consideration of both existing process and facilities for plutonium separations, the Redox process, the Carbide and Carbon Uranyl Ammonium Phosphate process, uranium solvent extraction alone, and various combinations and couplings of parts or entities of the above. Comparative evaluation has been based on the relative assurance of obtaining both plutonium and uranium production; recovery of both ``aged`` and ``current`` metal wastes; timing for developing, design, and construction; economics of capital investment and operating costs; and process complexity, adaptability, and safety. This survey has resulted in conclusions and recommendations for a unified program of separations process development, design, and construction. It is the purpose of this letter to present these conclusions and recommendations, together with a brief summary of the reasons leading to their establishment.

Work of the pile physics and experimental physics groups is reported. Theoretical work is also reported.

The meetings divided into two parts, with reviews of work being done in radiobiology at the University of California by various members of their staff as part one, and, as part two, a meeting conducted by Dr. Shields Warren for Laboratory Directors and their representatives. For the most part papers which were reviewed were summarized material which has appeared in the literature and gave progress to date. Since the purpose of the meeting itself was more for the informal directors meetings, results of the latter are here abstracted.

This report contains brief summaries of activities at the Hanford production reactors for the month of Oct. The activities for the Pile Physics Group are: (1) H Area start-up; (2) outlet temperature recording systems; (3) reactivity balance for each pile for this period. Activities for the Experimental Physics Group are: (1) graphite testing; (2) 305 testing -- P-slug standardization and graphite standards; (3) shielding. Also status is given on critical mass project.

Waste disposal, pile operations and P-10 operations are reported. Construction in the 100 (Pile) areas, 200 (Separations) areas, and 400 (Technical Center) area is described. General work included Richland paving, the Southern Railroad connection, and the Richland levee. Personnel data and visitor information is also included.

On June 29th and July 13th, 1949, the Industrial Hygiene Group of the Health Instrument Divisions at HAPO conducted a study of the health aspects of the degreaser operations carried on in the Airlock adjoining the 105 Building in the 100 H Area. This was done at the request of the Medical Division. The results of the study, together with certain pertinent information concerning degreaser operation, are reported in this report.

Preface: The existence of adequate experimental equipment, in particular the two operating cyclotrons of the Radiation Laboratory and the large 184-inch unit under construction, together with a nucleus of trained personnel, made it inevitable that work in connection with the war effort would be prosecuted vigorously at the University of California.

Preface: The existence of adequate experimental equipment, in particular the two operating cyclotrons of the Radiation Laboratory and the large 184-inch unit under construction, together with a nucleus of trained personnel, made it inevitable that work in connection with the war effort would be prosecuted vigorously at the University of California.

A potential source of dangerous concentrations of hydrogen cyanide exists in the plating room of the Machine Shop where open plating baths containing cyanide salts are maintained and where solid cyanide salts are stored. Also the use of hydrogen sulfide in certain steps of the waste disposal process has lead to noticeable and sometimes objectionable concentrations of this gas in the air of the "WD" Building. In view of the toxic properties of these two gases, it was desirable to set up suitable tests to determine the actual concentrations present in the air of the respective working areas.

This is a progress report from Brookhaven National Laboratory for the period July 1 through December 31, 1949.

By test duplicating actual operating conditions the average load was found to have a power factor of 95 percent and to be about 75 percent rated load. Since the Sola transformers must be operating into a load having a power factor of 90 percent and about 85 percent rated to attain proper output voltage, power factor corrective networks consisting of inductance and resistance in series were paralleled with the load. When these networks were added, the desired output voltage was attained. Several units have been successfully correction be used on the remaining units.

Samples from a single drilling made at Arco, Idaho were submitted to determine the adsorptive capacity of soil at Arco, Idaho for radioactive elements.

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Group 10 - The following items were shipped to Scioto Laboratory: 6 Thyratron Heater Controls (TR-1-A), 2 Switch Boxes (for P & E), 1 Log Amplifier (AM-1); 1 Pulse Generator (PG-1-B). The following are completed, tested, and awaiting transportation: 3 Two-Input B-wall Mixers (MX-2-A), 1 Pulse Generator (PG-1-B),1 Regulation Checker (RC-1) (for plating control power supplies), 1 Preamplifier (AM-2) (for Berkeley decimal scaler). The following are under construction: 6 Pulse Generators (PG-1-B) (for Health Division) (EO-508) 90%, 10 Switch Boxes (8 for P & E, Scioto, 2 for P& E, "T" Building) 85%, 6 Junction Boxes (for P&E, "T" Building, EO-486) 90%, 2 Four-Input G. M. Mixers. One on EO-17, one from Unit III. The mixers have been finished and tested for some time. The scalers (Nuclear Instrument Model 161-G) have just been received and are being modified for use with the mixers. A prototype preamplifier for the Berkeley decimal scaler was constructed and tested. Group 11 - A special pulse generator having output pulses fixed in time, and adjacent pulses variable in time with respect to the fixed pulse is under development. An initial mock-up of such a generator showed promise in that the variable pulses could be shifted …

This semiannual report includes references in future items in the Brookhaven National Labratory program as well as an account of progress in the post six months.

An experimental range-energy relation in Ilford C-2 emulsion has been obtained for proteins up to 39.5 Mev. In the region from 17 to 33 Mev the relation for dry emulsion is fitted by the empirical equation E{sub (MeV)} = 0.251 R{sub ({mu})} 0.581. Variations in water content due to changes in atmospheric humidity make several percent difference in range. The range in Ilford glass is found to be 18 {+-} 4 percent longer than in dry C-2 emulsion.