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High-power target development for accelerator-based neutron capture therapy

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dc.contributor.advisor Jacquelyn C. Yanch. en_US Blackburn, Brandon William en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Nuclear Engineering. en_US 2006-03-24T18:11:24Z 2006-03-24T18:11:24Z 2002 en_US 2002 en_US
dc.description Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2002. en_US
dc.description Includes bibliographical references. en_US
dc.description.abstract The production of clinically sufficient dose rates in Accelerator-based Neutron Capture Therapies (ABNCT) requires targets that can withstand ion beams of 2-10 kW or higher. Designing such a target requires knowledge of the current density profile which can exceed 1 mA/cm². A method has been developed to quantify the two-dimensional current intensity by utilizing the positrons emitted from the products of either the ¹²C(d,n) or ¹¹B(p,n) reaction. A desktop scanner was used to convert the dose profile measured with MD-55-2 radiochromic film into a map of beam current intensity. Analytic calculations coupled with Monte Carlo methods determined the resolution of this technique to be 0.22±0.01 mm. Liquid gallium metal was investigated as a possible coolant. Qualitative and quantitative comparisons between single submerged impinging jets of liquid gallium and water at low flowrates were supplemented with computational fluid dynamics. Experiments using an array of submerged jets were conducted to determine area-averaged Nusselt number correlations for water and gallium over a Reynolds number range of 7000<Re<38000. The spreading factor, β[sub]max, was introduced into the gallium correlation to account for surface wetting effects. Area-averaged heat transfer coefficients, h, produced by an array of gallium jets were found to exceed those of water for Re>13500. At a Reynolds number of 35000 an h of 10⁵ W/m²K was measured with the gallium array compared to 5.5xlO⁴W/m²K for water. Simulations of the thermal and mechanical stresses found that a gallium-cooled beryllium target could withstand beam powers of up to 20.2 kW. en_US
dc.description.abstract (cont.) Because of its low melting-point, lithium targets were able to achieve 10 kW only if the beam power density was kept below 11.6 MW/m². No significant difference in figures of merit used to characterize neutron beams for ABNCT were found when water was replaced by liquid gallium as the cooling fluid. en_US
dc.description.statementofresponsibility by Brandon William Blackburn. en_US
dc.format.extent 228 leaves en_US
dc.format.extent 10338063 bytes
dc.format.extent 10337870 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.subject Nuclear Engineering. en_US
dc.title High-power target development for accelerator-based neutron capture therapy en_US
dc.type Thesis en_US Ph.D. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Nuclear Engineering. en_US
dc.identifier.oclc 55012236 en_US

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