Report describing results of experiments that involved injecting radioactive yttrium into animals: "The excretion, retention, and distribution of the yttrium was measured, and its effect on survival and growth was observed. The average total excretion of Y91 to the time of death (from 76 hours to 24 days) was a little less than 30 per cent of the injected dose" (p. 2).

This report for September, 1947 describes progress regarding ore dressing and pyrometallurgical studies, chemical work, analytical work, identification work, and future work

This report for October, 1947 describes progress regarding ore dressing and pyrometallurgical studies, chemical work on phosphates, chemical work on shales, and analytical work.

This report for November, 1947 describes progress regarding chemical work on shales and organic precipitants for uranium.

Abstract: The procedures recommended for analysis in Department 190 Laboratories, in the Limits Control Laboratory, and in the Analytical Development Laboratories, of all process materials from the HCP cycle are presented in a stepwise manner. A description of the characteristics of each sample type along with a brief description of factors involved in the Analytical Quality Control program is included.

Abstract: The output signal of a linear accelerator may have a rise time of 1-2 x 10[minus]7 seconds. Therefore, the output of a pulse height selector operating on this signal has a variation of delay from the original signal of about this amount. In the instrument to be described in this technical report this difficulty is largely resolved.

From introduction: "It is the purpose of this report to give two further methods of determining end point of pontentiometric titration, neither of which require the plotting of a graph."

"This report gives briefly a rather simple method for fabricating foils from uranium buttons. Two log sheets one of a U-238 run and one of a U-255 run are given."

Report describing quantitative recovery traces of electrolyzable metals in a mercury cathode. The majority of the report is concerned with separation of metals from concentrated uranyl sulfate solutions.

Summary: "It has been demonstrated that the electrolysis-distillation stages of the procedure that has been developed for traces of metals may be utilized, with certain precautions, to recover milligram quantities of cadmium, cobalt, copper, iron, nickel and zinc. Lead remains partially as undissolved lead sulfate and hence the recovery of amounts ranging from 1 - 5 mg. is not advisable by this procedure."

Updated report about work that originated in February 1942 for the purpose of determining minor amounts of cadmium in uranium and related materials. A method was developed over a long series of studies made following the original report for determining small amounts of various materials in uranium and in a variety of other materials.

Report describing an updated method to determine traces of metals under polarographic studies, which operates at a higher cathode current density with a small area of the anode immersed in the solution where an appreciable quantity of iron was present in the solutions that were to be polarographed. The results of these studies are also presented.

Abstract: In the Biology Division, the maintenance of animals containing radioactive materials posed many problems. In addition to routine care of the animals, protection had to be provided for the personnel who worked with the contaminated animals. Frequent air changed in the room in which the animals were caged were necessary: farm workers were required to wear masks; animal cages were checked regularly for radiation; acid was used on the sawdust in the excrete pens; and a new, more efficient type of cage was designed. The most import feature of the new cage was that the support for the screen floor was outside the confines of the cage. Stainless steel was the preferred metal for case construction. Photographs and working drawings of cages for mice, rats, guinea pigs, rabbits, and goats, and several types of metabolism cases are included in this paper. Cage decontamination was accomplished with the aid of complexing agents such as citric acid or sodium tartrate. Under certain conditions, nitric acid was used.

Abstract: Equations are given to calculate at least approximately the heating in solid and hollow cylinders, slabs and spheres. Short and long cylinders are treated as well as short and long solenoids. The complicated mathematics used to derive the equations given will be omitted as they may be found in the original references. Heating with a spark gap converter is covered. Equations are given which together with some experimental data should enable the reader to predict the efficiency, heating, or temperature to be expected as the charge or coil is changed. Units and conversion factors are mentioned briefly.

From introduction: "At a certain stage in the design of a pile there come a time when it is urgent to obtain day to day answers on the effects of various changes in the design parameters... It is hoped that the procedures described in the present memo will serve as a bridge between the crudest diffusion theory calculations and the more elaborate multi-group methods."

The following preliminary report describes obliquity factors for shields of various shapes.

The following document is a compilation of quarterly reports from August 1946 to November of 1947 from the Biology Division of the University of Chicago.

The following documents were compiled into a quarterly report that was to be published in the Radiobiology Volume of the PPR. The following reports provide data from the Biology department of the University of Chicago between May and August of 1947.

This report analyzes the separation of ions using the velocity of the ion measured through a long evacuated drift tube.

A report which provides procedures for sample decomposition and the determination of small amounts of uranium in the phosphate rocks and shales. Also, the cupferron and ether-extraction methods are discussed.

This report covers progress in chemical and spectrographic analysis, chemical work, beta-counting methods of analysis, and ore-dressing and pyrometallurgical studies.

This report for January, 1947 discusses progress regarding ore dressing studies, pyrometallurgical work, chemical work, chemical and spectrographic analysis, and physical methods of analysis.

This report for June, 1947 describes progress regarding ore dressing and pyrometallurgical studies, chemical work, analytical work, and beta counting.

This report for May, 1947 describes progress regarding analytical work, chemical work, beta-counting methods of analysis, ore-dressing and pyrometallurgical studies, and pyrometallurgical work.