This report discusses the multi-channel pulse analyser including its components and operation.

From cover page: This document has been assigned the above MDDC (Manhattan District Declassification) number, as given in the List of Declassified Documents issued semi-monthly by the Research Division, Manhattan District. In the case of Los Alapnos reports, LADC (Los Alamos Declassification) numbers are listed on the title page if known. This declassified document may differ materially from the original classified document by reason of deletions necessary to accomplish declassification. Hence, this copy of a declassified document does not constitute authority for declassification of classified copies of a similar document which may bear the same title and authors. Reference is made to District Circular Letter (Research Control 47-3) dated 31 October 1946, subject: "Instructions for Use of List of Declassified Documents," which outlines the procedure by means of which declassification of classified copies may be effected. Every effort has been made to reproduce with accuracy of detail the declassified document as certified for declassification. No corrections or changes have been made in the content of the document.

Abstract: Mice of different ages ranging from 1.5 to 12 months have been exposed to gamma rays in an effort to determine the change in radiosensitivity with age. The dose necessary to cause 50% killing was determined for each age group and sex. No change in sensitivity with age was observed with either sex, although the experimental error in the case of the males was quite large. The females were found to be more resistant than the males.

Abstract: The purpose of this research was to obtain data that would be useful in predicting changes that might be expected to occur in the oxidation state and degree of hydration of powdered uranium oxides maintained for long periods of time at temperatures between 30 and 300 degrees C. in the presence of excess water, hydrogen, oxygen and possibly hydrogen peroxide. The reaction of hydrogen and oxygen with water slurries of U3O8 were studied at 100-300 degree C.

An investigation of the preparation and some of the physical properties of UBr3, UBr4, UOBr2 and UO2Br2 has been carried out in order to studey methods of preparing UBr3 and UBr4.

Methods of conversion of UF4 to U3O8 by fusion with ammonium oxalate dihydrate and other salts are described.

The toxic effects and metabolism of radiostrontium (Sr89-Sr90) were studied

A guide on writing secret reports or memoranda.

Nickel interferes seriously with the reduction of uranyl solutions in the Jones reductor. Nickel ion, if added after reduction of a uranium solution has no harmful effect upon the aeration and the titration with standard ceric sulfate solution.

This study concerns with a critical study of the conditions for development of the color with turmeric, which follows the distillation procedure and the evaporation of the lime water solution that has been used to recover the boron methyl ester that distills.

This study presents the analysis of the uranyl cupferrate that is precipitated from neutral or slightly acidic solutions of uranyl sulfate upon adding a slight excess of cupferron.

This paper is to develop the theory of the unsteady-state behavior of these cascades and to present simple ways of thinking about this behavior

When plutonium is introduced into the body either by injection or by intratracheal instillation, there are, in addition to the usual signs of damage to the lymphoid tissues, definite alterations in the metabolism of tissues.

This paper reports the results of a qualitative investigation of the urnaium-oxygen system at pressures varing from one atmosphere to 150 atmospheres, and at temperatures up to 750° C

Uranium Tribromide has been prepared both by the reduction of the tetrabromide with hydrogen at 600-700° C, and by direct union of uranium and bromine at about 580°C. An attempt to prepare the triiodide of uranium by the latter method was unsuccessful

The purpose of this report is to furnish information which will aid in the operation and servicing of the "A" counting system.

This article covers investigations carried out on an ultramicrochemical scale with volumes from 0.1 to 0.5 of a microliter and 0.5 mg of plutonium being used.

The LD 50 in 30 days was found to be between 7 and 8 uc/g of Sr89-Sr90 when administered intraperitoneally to mice; for rats it was slightly less than 5 uc/g; for rabbits it was also slighly less tha 5 uc/g

The heterophil and lymphocyte counts of 67 rabbits exposed to fast neutrons, and those of 123 rabbits exposed to 200 kv X rays were analyzed.

In the (Ha-La)140 experiments mice and rats were injected intraperitonially with toxic doses of radiobarium. The weight curves indicate that there was definite retardation of growth in mice and 2.25 uc/g and in rats at 1.98 uc/g.

Mice, rats and rabbits excreted Sr89-Sr90 very rapidly following intraperitoneal or intravenous administration. The greatest part of the excretion took place during the first three days, and by 10-15 days virtually no more of the retained strontium was excreted.

Evidence is presented indicating that both acute and chronic radiation anemia are due, in part, to a hemolytic reaction, and not solely to an inhibition of erythropoietic activity as has been assumed by most investigations.

The electrolysis of tetra- and tri-halides of uranium in fused salt systems at temperatures from 700°-900° C has been investigated. Serious losses are caused by reaction with atmospheric oxygen, refractories and electrode materials.

Swift snuffle free rabbits were exposed to cyclotron fast neutrons provided by the reaction of 8 Mer deuterons on a beryllium probe.