Prospectus` of Band Pass Amplifiers for Proportional Counters and Instrumentation for the Study of the Electrodeposition Potential of Radioactive Elements have been submitted for review and approval. An error was found in calculations for the band pass amplifier discussed in Group 9 of the Electronics Progress Report,MLM-306, March 1--31, 1949, on the Cathode-Follower Probe. New calculations have been made and a band pass filter constructed to match the new values. Work on the cathode-follower circuit for coupling a Boron-wall tube to its linear amplifier indicated that the limit to the sharpness of a pulse which could be achieved was possibly caused by poor amplitude versus frequency response of the linear amplifier. To check this theory, modifications were made on an existing scaler which resulted in a frequency response flat up to 4.5 megacycles. Plans are being made to improve the amplitude versus frequency of the higher frequencies. The response curve shows a slightly rising characteristic at 4.5 megacycles and an attenuation at 7 megacycles. Construction of the rf generator has been resumed in an effort to deliver the finished product to Group 4 by approximately May 6, 1949. The meter circuit will measure relative rf output voltage instead of absolute …

Considerable study has been given to the problem of a cathode-follower coupling circuit for matching a B-wall tube to a properly terminated coaxial cable. A matched circuit makes it possible to obtain faster counting rates independent of practical cable lengths. A breadboard circuit has been built and first results indicate that a two millivolt signal at the input of the cathode-follower will operate the Model 162 Instrument Development Laboratory Scaling Unit when adjusted for maximum gain. This is comparable to the voltage available when the B-wall tube is coupled to its amplifier through a coaxial cable. Shielded room measurements have been completed in the ``R`` Building. One log-amplifier (EL-257) was delivered to group 32, one scaler-multiplier (EL-252) to group 34, one four-input GM mixer (EL-247 to Group 24, and the plating control regulation checker (EL-258) plus the portable pulse generator (EL-261) to Group 12. The scaler-multiplier (EL-253)is 20 per cent complete and the motor-driven slide wire and the four-input gamma mixer (EL-262) are 95 per cent complete. The manufacturing specifications for plating controls and the instruction book for the portable pulse generator (EL-2561) have been submitted for duplication and should be completed by January 31, 1949. The two (2) 6 …

With the completion of tests of the prototype cathode-follower, it was decided to produce three more models. These have been constructed and pass the same pulse as that of the prototype. Drawings are being made of these units. By the time these units had been completed, the amplifier of the scaler was modified so that its frequency response was essentially flat up to 4.5 megacycles. Using this amplifier and the cathode-follower, a study of the pulse shapes was made and four different pulse shapes were found to be obtainable. A band pass network between the B-wall tube and the input of the cathode-follower provided a very substantial improvement over the shunt peaking network with a band pass of 1.8 to 6.5 megacycles and provided clean, uniform pulses. Plans are being made to experiment with a filter of narrower band pass, which, if satisfactory, will produce greater amplitude. When the final band pass has been determined, a combination of shunt peaking and band pass networks should provide a net gain of 30% in amplitude. The result of this research is to provide an immediate improvement in resolution loss and a possibility of realizing a still lower minimum resolving time when the …

The Fermi-Thomas model has been used to derive the equation of state of matter at high pressures and at various temperatures. Calculations have been carried out both without and with the exchange terms. Discussion of similarity transformations lead to the virial theorem and to correlation of solutions for different Z-values.

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The redox and pile operations are reported on. Construction in 100 (Pile), 200 (Separation), and 300 (Metal Fabrication) areas is described. General work in the Richland commercial areas and on the Southern Railroad connection is also described. Personnel information is disclosed.

This report details events of importance reported by the Hanford Operations Office for the week ending February 16, 1949.

This report details events of importance reported by the Hanford Operations Office for the week ending February 23, 1949.

Redox operations and waste metal recovery are reported. Construction in the 100-H, 100-DR, P-10 area pile areas and in the 234-5, 241-BY waste storage, and redox areas, process areas and Richland village are described. Visitor information is given. And construction progress at Schenectady is reported.

This report details events of importance reported by the Hanford Operations Office for the week ending June 15, 1949.

This report details events of importance as reported by the Hanford Operations Office for the week ending June 29, 1949.

This report details events of importance reported by the Hanford Operations Office for the week ending March 16, 1949.

This report details events of importance reported by the Hanford Operations Office for the week ending March 30, 1949.

This report details events of importance reported by the Hanford Operations Office for the week ending May 4, 1949.

This report details events of importance reported by the Hanford Operations Office for the week ending May 18, 1949.

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.

No administrative or operations significant events are reported. Construction in the pile areas, separations areas, and the technical center is reported. The Southern Railroad connection, Richland paving and related work, and housing work is described. Personnel and visitor data is presented.

This report details events of importance as reported by the Hanford Operations Office for the week ending September 28, 1949.

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A comparison of the decay constants of Be{sup 7} in beryllium oxide and in beryllium fluoride has given {lambda}{sub BeO}-{lambda}{sub BeF{sub 2}} = (+1.375 {+-} 0.053)10{sup -3}{lambda}{sub BeO} thus showing a definite effect of the chemical binding on the radioactive decay constant.

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