Gamma-ray Penetration Experiments for a Light Aircraft Carrier Using Distant Sources and Sources Simulating Contamination of the Hull PDF Download
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Author: S. Tomoeda Publisher: ISBN: Category : Aircraft carriers Languages : en Pages : 92
Book Description
The penetration of gamma rays into compartments of an aircraft carrier from two different radioisotopes was measured in two different experiments. In one experiment, cobalt-60 and cesium-137 point isotropic sources were exposed near the hull of the ship to simulate hull contamination. Measurements of dose were made in the forward part of the ship at four different deck levels. Dose distribution data are presented for the two sources used and for the different source points considered. In the second experiment, nominal 500-curie collimated cobalt-60 source was exposed at a distance of roughly 100 feet from designated points to irradiate two general regions of the ship. Dose distributions are presented for each of 18 different source positions used. Five decks were in instrumented in each of the two general regions considered. Diagrams indicating source positions, and hull-plating thicknesses are also presented.
Author: S. Tomoeda Publisher: ISBN: Category : Aircraft carriers Languages : en Pages : 92
Book Description
The penetration of gamma rays into compartments of an aircraft carrier from two different radioisotopes was measured in two different experiments. In one experiment, cobalt-60 and cesium-137 point isotropic sources were exposed near the hull of the ship to simulate hull contamination. Measurements of dose were made in the forward part of the ship at four different deck levels. Dose distribution data are presented for the two sources used and for the different source points considered. In the second experiment, nominal 500-curie collimated cobalt-60 source was exposed at a distance of roughly 100 feet from designated points to irradiate two general regions of the ship. Dose distributions are presented for each of 18 different source positions used. Five decks were in instrumented in each of the two general regions considered. Diagrams indicating source positions, and hull-plating thicknesses are also presented.
Author: S. Tomoeda Publisher: ISBN: Category : Radiation dosimetry Languages : en Pages : 50
Book Description
In order to correlate some basic measurements of radiation attenuation made on an aircraft carrier to other situations and geometries, experiments were carried out to study the effects of source distance on the dose distribution inside a model-sized compartmented structure intended to simulate the carrier. Data are presented in the form of buildup factors (B[r) as functions of source-to-detector distance for two configurations of the compartmented structure. Buildup factors are also presented as functions of the slant path through the interposing steel plates for the case where the source is considered far from the structure. Comparisons of B[r within our complex structure with single-slab values are also included. In every case, the buildup factor for the compartmented structure was found to be consistently and significantly lower than the single-slab data. The greatest difference in buildup (B[r-1) amounted to 30 percent.
Author: S. Tomoeda Publisher: ISBN: Category : Languages : en Pages : 120
Book Description
The penetration of gamma rays into compartments of an aircraft carrier from three different radioisotopes was measured. Co60, Cs137 and Ir192 sources were exposed on the Flight Deck and dosimeters were used to measure dose in two general areas of the ship at three different deck levels. Data of dose distribution are presented for the three sources used and for the different source points considered. Diagrams indicating source positions, detector positions, deck and compartment wall thicknesses and main structural member specifications are also presented. (Author).
Author: R. L. Mather Publisher: ISBN: Category : Collimators (Optical instrument) Languages : en Pages : 46
Book Description
Expressions are developed which give the amount of unidirectional radiation from a distant radiation source passing through a cylindrical hole in a slab of material, including the amount of radiation which penetrates the edges of the hole, as a function of angle between the radiation direction and the axis of the hole. The modifications necessary for sources at finite distances are indicated. These functions are integrated over appropriate angles for distant line sources and for extended sources. It is shown that, to a first approximation, the results are the same as the geometrical aperture for a like diameter hole in a similar slab with one mean free path of material removed from each side. The effects due to scattering from the walls of the collimator are discussed and an approximate method of calculation is presented with results for a specific collimator.
Author: S. Tomoeda
Author: S. Tomoeda
Author: S. Tomoeda
Author: 
Author: S. Tomoeda
Author: 
Author: N. E. Scofield
Author: M. B. Hastings
Author: 
Author: R. L. Mather
Author: S. K. Penny