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A Method for Neutron Energy Measurement
Description:
This technical report discusses a method proposed to measure neutron energies by accurately determining the momenta of recoil protons in a magnetic spectrometer specially designed for this purpose. The main consideration in the design of the spectrometer is the shielding of the detector from the high radiation background associated with intense neutron beams.
Date:
October 18, 1944
Creator:
Nedzel, V. Alexander
Item Type:
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Report
A Sensitive Particle Ionization Chamber for Neutron Detection
Description:
Abstract. A particle ionization chamber of sensitivity sufficient to detect a source of one neutron per second has been used to measure the neutron yield from a thick target of sulfur upon bombardment with polonium alpha particles. The high-geometry boron trifluoride chamber used had an efficiency of 1.9 percent for fission neutrons. The neutron yield from a thick target of sulfur was measured by this instrument and found to be .0035 +- .0013 neutrons per million incident polonium alpha particl…
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Date:
November 21, 1944
Creator:
Sturm, William J. & Dabbs, John
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Report
A Final Report on the Experiment : the Penetration of Graphite of Different Purities by Lead Bismuth Eutectic
Description:
Bi-Pb eutectic and pure Bi penetration of graphites of various densities under 300 degrees C and pressures up to 20 psi was found be of the order of magnitude of 1.0 g/cm(2) and was uniform throughout the graphite. Bi was absorbed less than the eutectic but the oxidation rate of Bi would be prohibitive. There was heavy nitriding in N atmospheres with the Bi and the eutectic.
Date:
September 25, 1944
Creator:
Stroud, William G.
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Report
Flexibility of a Tube in Which Slugs Slide
Description:
An approximate calculation is made of the variations of the flexibility of a long cartridge with the length of the slug used, assuming that the jacket slides without friction.
Date:
September 13, 1944
Creator:
Young, G.
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Report
Engineering Group Instrument Specification Report : Tests on Aquadag Treated Polyethylene Cable
Description:
Effect of aquadag coating on noise reduction in polyethylene coaxial cable was tested. A satisfactory combination of coaxial cables and connectors interconnecting sources of small ion currents or ionizing impulses with the measuring device is described.
Date:
September 4, 1944
Creator:
Weller, Barton L. & Dorsey, John M.
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Report
Further End Cap Temperature Calculations
Description:
Abstract. Recently (CP-1989) it has been shown that the neutron density, and thus the heat production, at the end of a slug with an A1 cap may be appreciably higher than that at the middle of the slag. A re-examination of earlier temperature calculations is made in light of this effect.
Date:
August 16, 1944
Creator:
Karush, William; Monk, A. T. & Wilkins, J. Ernest, Jr., 1923-2011
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Report
Warping Instability in Long Rods
Description:
Abstract. If a pile rod gets bowed within its cooling tube it becomes warmer on the side which approaches the tube wall, and thermal expansion tends to warp it in the same direction as the original displacement. This was discussed roughly in N-601, and it was there concluded that the mechanism was not important for an isolated short slug. In connection with current development of continuous jacket (cartridge) assemblies, it seems desirable to look at this question again. In this case it is poss…
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Date:
August 17, 1944
Creator:
Young, Gale Jay
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Report
Progress Report : Low Geometry Alpha Particle Ionization Chambers
Description:
ABSTRACT. When solutions of high specific alpha activity are to be assayed for product, it is often difficult to obtain reproducible results by diluting the solution sufficiently to remove a small volume from which a sample can be prepared and counted at 52% geometry. In order to assay such a solution, most reproducible results have been obtained with minimum effort in sample preparation by making use of low geometry chambers. Two types of low geometry chambers are described: 1) The air-screen …
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Date:
November 8, 1944
Creator:
Borokowski, C. J.; East, J. K. & Flatau, C.
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Report
The Distribution of Thermal Neutrons in a Slug with Thick End Caps
Description:
The distribution of thermal neutrons in a W slug having a one centimeter aluminum end cap has been calculated on the basis of simple diffusion theory. It is found that the average neutron density, and therefore the power output, at the end of the slug is about 34% higher than the density far from the end cap. This result agrees well with the recent Argonne pile experiments (CP-1729).
Date:
August 3, 1944
Creator:
Wilkins, J. Ernest, Jr., 1923-2011
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Report
Temperature and Heat Flow in a Graphite Electrode
Description:
In making various experimental heat studies a power producing metal slug is simulated by a slug with a graphite rod electrode of 3/8" diameter inserted lengthwise through it. There is a helium filled annular space between the graphite and the inner surface of the slug cylinder. Radiant heat passes from the electrode to the metal; with proper adjustment of the electrode current the slug in the steady state will therefor "produce" the same amount of energy from its exterior surface as it would un…
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Date:
August 3, 1944
Creator:
Schlegel, R.
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Report
Sealing of Holes in Aluminum Sheet by Oxidation
Description:
Aluminum oxide occupies a larger volume than the aluminum it contains would fill as metal, consequently, the assumption has been made that holes in metallic aluminum would close by a sufficient amount of oxidation. Therefore, we were asked to investigate the rate of plug formation under conditions to be expected in the pile. For the latter we were requested to approach the pile conditions as nearly as we could by employing the Chicago cyclotron. It seems to us that the problem divides itself in…
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Date:
July 15, 1944
Creator:
Anderson, S. & Goldowski, N.
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Report
Extrusion of Compound Tubes of Aluminum and B4C
Description:
Various experimenters have shown (H.H. Gersman U.S. Patent 2,335,590, Nov. 30, 1943; Aluminum Co. of America, various technical papers; also CT-482) that when a billet is extruded by proper technique into a rod (or tube by a floating mandril) that flow of material is streamline and and the extruded article is essentially a space replica of the billet, with linearly distorted coordinates. Advantage is taken of this fact in the manufacture of alclad tubing in which a billet containing an inner co…
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Date:
July 1, 1944
Creator:
Creutz, E. C.
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Report
The Effect of the Maxwell Distribution of Velocities on the Neutron Density and Diffusion Length in a Metal Sphere
Description:
The change in the simple [formula] distribution of neutrons in a spherical lump of uranium caused by the distribution in velocities of thermal neutrons is calculated. If the calculated curve is fitted as well as possible by a simple [formula] curve, it is shown that the value of [formula] obtained in this way is a function of [formula], the radius of the sphere. For small radii the [formula] obtained in this manner will be as much as 25% greater than the [formula] corresponding to average veloc…
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Date:
June 27, 1944
Creator:
Plass, Gilbert N.
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Report
Representation of Slowing Down Functions in Water by Synthetic Kernels
Description:
Fermi, Anderson, and Nagle's experimental distribution of Indium resonance neutrons around a point source of fission neutrons in water has been fitted by analytic expressions which are source functions in the two-group, three-group, Fermi and Christy-Wheeler pile theory. The Christy-Wheeler function (exponential followed by a Gaussian) is the best fit; the two-group function (exponential) is slightly better than the Fermi Gaussian.
Date:
June 1, 1944
Creator:
Cahn, Albert, Jr.
Item Type:
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Report
Jacket Temperature Near End of Slug
Description:
Some situations which give rise to a hot ring around the slug near the end are considered; namely rounded slug ends in the long cartridge design, and the Wilkins effect in the current unbonded short slug design.
Date:
June 23, 1944
Creator:
Young, Gale Jay
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Report
A Case of Rod Warping
Description:
Warping of a rod by a variation in heat transfer coefficient around the periphery is considered. Estimates for some simple cases are given, and a more precise numerical calculation is carried out in ne instance.
Date:
May 27, 1944
Creator:
Murray, F. & Young, Gale Jay
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Report
Experiments on the Evaporation of Boron in Vacuo : Progress Report No. 1 on a Phase of Problem No. 132 - ML - 56-3; File Serial 13
Description:
It was desired to determine a method of evaporating boron to form a rather pure uniform tenacious coat of specified thickness. These coats are needed as monitoring films for neutron intensities, particularly in steel ionization cylinders. The most satisfactory method of evaporating boron employed a graphite filament. A mixture of amorphous boron and Carbenoid A was painted onto the filament which was then heated by electrical resistance method to 2300 degree C at which temperature the boron eva…
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Date:
March 31, 1944
Creator:
Friel, D. D.
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Report
Metallurgical Laboratory, Nuclear Physics Division, Report for the Month Ending May 25, 1944
Description:
Technical report with short reports from the (1) Experimental Nuclear Physics Group; (2) Theoretical Physics Group ; (3) Lattice Design Group; (4) Pile Design Group; (5) Exponential Experimental Group; (6) Radiation Group; and (7) Shielding Group.
Date:
June 14, 1944
Creator:
Fermi, Enrico, 1901-1954
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Report
Thermal Stresses Arising from Defective Strip in Bond
Description:
Stresses set up by an insulating strip in the bond are estimated and found to be small compared to those normally present without the defect.
Date:
May 18, 1944
Creator:
Young, G.
Item Type:
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Report
The Diffusion Length of Thermal Neutrons in Uranium
Description:
Measurements made in a uranium cylinder result in a mean value of 1.55 cm. for the diffusion length L for distances of 1 to 4 cm. from the base of the cylinder. Calculations give a value which agrees with the experimental result and show further that L increases from 1.40 to 1.63 cm. as the neutrons diffuse a distance of 5 cm. into the uranium.
Date:
May 27, 1944
Creator:
Hughes, Donald James, 1915-1960 & Bragdon, E. W.
Item Type:
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Report
Resonance Absorption of Uranium in Mixtures
Description:
A good determination of the resonance absorption of uranium when admixed with various substances is necessary so that calculations can be made on the efficiency of homogeneous piles. The original experiments along these lines were undertaken by Creutz, Jupnik, and Snyder (C-116) and consisted of experiments on the resonance capture in pure U, UO2, U3O8, and one experiment on capture in a mixture of U3O8 and graphite. These experiments were done at the cyclotron in Princeton and consisted of det…
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Date:
March 31, 1944
Creator:
Mitchell, Allan C. G. (Allan Charles Gray), 1902-; Brown, Leon J.; Pruett, John R. & Nering, Evar D.
Item Type:
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Report
Determination on Neutron Density With Bismuth Foils : Final Report - Problem Assignment 131 - X21P
Description:
It is usual to determine the density of neutrons by using foils of metals which become radioactive as a result of bombardment in the region under investigation. From the rate of disintegration of the newly formed radioactive element the number of neutrons absorbed can be calculated. By use of the capture cross section of the element of which the foil is composed the density of the neutrons can then be computed. By counting the alpha particles from a bismuth foil of known weight after exposure t…
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Date:
May 30, 1944
Creator:
Curtiss, Leon Francis, 1895-
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Report
On the Boundary Condition Between Two Multiplying Media
Description:
The transition region between two parts of a pile which have different compositions is investigated. In the case where the moderator is the same in both parts of the pile, it is found that the diffusion constant times thermal neutron density plus diffusion constant times fast neutron density satisfied the use pile equations everywhere, right to the boundary. More complicated formulae apply in a more general case.
Date:
April 19, 1944
Creator:
Friedman, Francis L. (Francis Lee), 1918- & Wigner, Eugene Paul, 1902-1995
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Report
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Middlesex County, MA
1
1
Miller County, AR
1
1
Mitchell County, NC
1
1
Mohave County, AZ
4
4
Monmouth County, NJ
1
1
Monongalia County, WV
1
1
Monroe County, GA
1
1
Montgomery County, MD
1
1
Montgomery County, OH
1
1
Montgomery County, TX
1
1
Natrona County, WY
2
2
Navarro County, TX
1
1
Newport County, RI
1
1
Nome Census Area, AK
2
2
Norfolk County, MA
1
1
Nowata County, OK
2
2
Orange County, FL
4
4
Osage County, OK
9
9
Ottawa County, OK
2
2
Ouray County, CO
1
1
Pacific County, WA
1
1
Park County, CO
1
1
Payne County, OK
1
1
Pend Oreille County, WA
1
1
Pennington County, SD
1
1
Perry County, TN
1
1
Pershing County, NV
2
2
Philadelphia County, PA
1
1
Pierce County, WA
1
1
Pike County, AR
1
1
Polk County, FL
1
1
Polk County, GA
2
2
Polk County, IA
1
1
Posey County, IN
1
1
Presidio County, TX
1
1
Preston County, WV
1
1
Prince George's County, MD
1
1
Providence County, RI
1
1
Rogers County, OK
1
1
Rutherford County, NC
1
1
Rutland County, VT
1
1
Salt Lake County, UT
1
1
San Bernardino County, CA
1
1
San Juan County, CO
1
1
Shenandoah County, VA
1
1
Sierra County, NM
1
1
Skagit County, WA
1
1
Spokane County, WA
1
1
Stanislaus County, CA
2
2
Stevens County, WA
2
2
Stillwater County, MT
1
1
Sullivan County, NH
1
1
Summers County, WV
1
1
Summit County, OH
1
1
Sussex County, NJ
1
1
Sweet Grass County, MT
1
1
Tillman County, OK
1
1
Tippecanoe County, IN
1
1
Tolland County, CT
1
1
Tooele County, UT
1
1
Tulsa County, OK
1
1
Tuolumne County, CA
2
2
Tuscaloosa County, AL
1
1
Union County, PA
1
1
Union County, TN
1
1
Upson County, GA
1
1
Wagoner County, OK
1
1
Walker County, AL
1
1
Washington County, OK
1
1
Washington County, PA
1
1
Washtenaw County, MI
1
1
Wayne County, MI
1
1
Wayne County, UT
2
2
Weld County, CO
1
1
Westmoreland County, PA
1
1
Wetzel County, WV
1
1
White County, IL
1
1
White Pine County, NV
1
1
Worcester County, MA
1
1
Worcester County, MD
1
1
Yancey County, NC
1
1
Yellow Medicine County, MN
1
1
Yukon-Koyukuk Census Area, AK
1
1
Filter: Years
This dialog allows you to filter your current search. Each of the Years listed note their name and the number of records that will be limited down to if you choose that option. The list can be sorted by name or the count.Filter: Months
This dialog allows you to filter your current search. Each of the Months listed note their name and the number of records that will be limited down to if you choose that option. The list can be sorted by name or the count.Filter: Days
This dialog allows you to filter your current search. Each of the Days listed note their name and the number of records that will be limited down to if you choose that option. The list can be sorted by name or the count.
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1st
29
29
2nd
14
14
3rd
16
16
4th
13
13
5th
15
15
6th
13
13
7th
9
9
8th
14
14
9th
16
16
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24
24
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17
17
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14
14
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14
14
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17
17
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24
24
16th
18
18
17th
15
15
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18
18
19th
11
11
20th
19
19
21st
13
13
22nd
19
19
23rd
19
19
24th
11
11
25th
16
16
26th
13
13
27th
17
17
28th
21
21
29th
14
14
30th
17
17
31st
9
9