Manufacturing of Precision Aluminum Molds for Proton Therapy Microdosimetry Testing
Authors: Macartney Ewing, Camilo Correa Alfonso, Dr. Wesley Bolch
Faculty Mentor: Dr. Wesley Bolch
College: Herbert Wertheim College of Engineering
This investigation aims to manufacture highly precise aluminum molds measuring 10 cm x 10 cm in varying thicknesses ranging from 0.5 mm to 2.5 cm. These molds were used to create slabs made of three proton tissue equivalent materials developed previously in our research group to behave as human bone, soft tissue, and lung tissue. These slabs will be used to perform microdosimetry measurements of the lineal energy along the Bragg Peak region and by using the microdosimetric kinetic model obtain the relative biological effectiveness (RBE) as a function of depth in these proton tissue-equivalent materials. To achieve an accuracy of 1 mm, the slabs need to be made with high tolerances to guarantee the desired dimensions and minimize the presence of air bubbles and indentations on the cast surfaces. Due to these requirements, the manufactured molds were created by assuring the internal surfaces are extremely flat and with the desired thickness. The molds constructed were able to create slabs as thin as 0.5 mm, while maintaining a near-constant thickness and very high surface finish. Microdosimetric measurements will be taken of these slabs after conducting proton therapy irradiations.
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