Report studying the differences in the penetrative abilities of "two polydispersed dioctylphthalate aerosols of different particle size distribution through 9 mil HV-70 type filter paper with and without pinholes" (p. iii).

Abstract: A control system to provide digital printing and to plot an analog trace on an electric operated IBM model 11C Output Writer is described. The Digital mode of operation translates multidigit numbers through a set of commands to print each digit serially, then presents them to the output writer in a time sequence. The Analog mode of operation converts a d.c. input voltage to a digital number and by tab and space bar commands translates the carriage horizontally a distance proportional to this number.

Report presenting a large number of measurements of natural environmental radiation in various parts of the United States using a 20-liter air filled polyethylene-walled ionization chamber at atmospheric pressure. The ionization current was measured with a vibrating reed electrometer connected as a continuously reading voltmeter driving a pen recorder" (p. 1).

Report that examines the dose rate of radiation in the air and in a test subject due to radioactive materials (uranium, thorium, and potassium) that are present in the ground. The test subject in these experiments is a water cylinder that is meant to receive radiation in a manner similar to a person.

Report measuring the density interface effect on gamma-ray intensities resulting from a point source. Results suggested a phenomenological representation to describe the behavior.

Abstract: An easy to use method for evaluating Bessel functions is given. This method is applicable to the one-dimensional, 2-group, 2-region diffusion problem, and is designed primarily for use on a small or medium sized digital computer. ...FORTRAN programs based on this method are presented together with the output obtained from an IBM-1620 digital computer.

Report regarding a program that measured carbon-14 that was released into the atmosphere above the United States via nuclear testing.

Report containing a computerized means to calculate the neutron interaction between fissionable material contained in cylinders up to an array size of 20 x 20 units.

Report containing a method for the determination of beryllium in urine samples. Contains the necessary materials, apparatus, and reagents, as well as the procedure and its results.

Report issued by the Atomic Energy Commission over studies conducted on the determination of cerium-144 in vegetation and soil. Materials and methods used in the determination are discussed. This report includes tables, and an illustration.

Report that describes experiments undertaken to determine the energy distribution of x-rays at the Health and Safety Laboratory following the installation of a 250 kV x-ray machine.

From abstract: "A rapid simple method has been developed for determining state of charge of the widely used nickel-cadium rechargeable battery. The method described is based on the experimentally verified relationship between farad capacitance and state of charge."

Report wherein "[a] statistical study of base line fluctuations is used to relate noise measurements with the resolution spread of a pulse height analysis system. The resolution is inversely proportional to the signal-to-noise ratio. The proportionality constant is derived on the basis of a normal amplitude distribution for noise. A review of noise measuring techniques is given and adapted for use with electronic voltmeters. The form factors required to interpret meter readings in terms of the RMS value of noise are described" (p. 1).

Report issued by the Atomic Energy Commission over computer-aided calculations for effective multiplication factors in cylinders. The methods, and applications of the calculations are discussed. This report includes tables, and illustrations.

Abstract: "The energy absorption spectrum of cosmic ray mu mesons at sea level was inferred from the omnidirectional momentum, the latter being obtained from the directional intensities of muons in various energy intervals at zenith angles of 0, 30, 60, and 68 degrees. ...From the energy absorption spectrum, a sea level muon dose rate of 2.23 microrads per hour was determined. This is consistent with measurements of the total cosmic dose rate."

Report covering a Victoreen Cavity Chamber which utilizes filtered beams from a 250 KVP, Ox 250 General Electric pulsating industrial X-ray machine. The facility, equipment, and procedure is described.

Report issued by the Atomic Energy Commission over environmental effects from the fallout of nuclear weapons tests. The long-term effects of nuclear fallout on the environment, and human life are discussed. This report includes tables, and illustrations.

Report describing the use of a 5" x 3" NaI(Tl) detector and a high pressure ionization chamber to obtain gamma ray spectra and total gamma dose rates at approximately 100 locations during the course of several survey trips in the southeastern, central, and western United States. Reasonably precise elements of the dose rates are made using the pulse height spectra and relatively simple methods of analysis. Total terrestrial dose rates as well as the partial dose rates from the uranium-238 series, thorium-232 series, potassium-40, zirconium-niobium-95, and rhodium-106 are tabulated for each location.

Report regarding ion chamber measurements made of the external environmental radiation in various location in the United States during the summer of 1957.

Abstract: Four filters for use with a 250 KVP pulsating X-ray machine were constructed to calibrate radiation detection instruments in the energy region below 200 KEV. Approximately monoenergetic beams of 63, 105, 150, and 180 KEV were produced. The spectral distribution was computer suing the formula of Kulenkampff. The energies were found to drop rapidly from the peak values. The average values were checked from absorption curves obtained experimentally and found to deviate from the computed peak values by 10%.

Report containing "flight data and (...) results of radiochemical analyses of stratospheric and tropospheric air filter samples collected during Project Star Dust. This report contains data for samples collected during June 1961 to December 1962, the first year and a half of the project" (p. 2).

Report documenting the investigation of cosmic and terrestrial background radiation. "Remeasurements in many locations furnished estimates of dosimetric increase in terrestrial levels due to fallout. Radiation measurement sin residential dwellings in he New York metropolitan areas are described" (p. 1).

Report documenting the measuring of strontium-90 levels contained in the bones of children and adults of various age brackets across the United States.

Report compiling data from previous HASL reports regarding the radioactive contamination of foods. Individual food items as well as total diets are analyzed.