Two-Part Radioisotope Target Insert for Heat Dissipation
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Solution Overview
Problem
The production of radioisotopes like 18F is limited by the power dissipation issues in the target material during irradiation, leading to restricted beam intensity and energy due to excessive heat generation, and existing materials for inserts pose challenges in machining complex designs and thermal conductivity.
Innovation Solution
An irradiation cell with a two-part insert design, where the cavity part is made of niobium or tantalum for high thermal conductivity and ease of production, and the surrounding part is made of a different material like stainless steel for structural support, allowing for internal cooling and improved thermal exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the intensity and energy of the particle beam are increased to produce more radioisotopes, then the yield of radioisotopes is improved, but the power dissipated by the target material increases causing excessive heat generation that damages the window and limits further intensity increase
Solution Approach 1:
The insert is divided into two separate parts: a cavity part made of niobium or tantalum with high thermal conductivity for efficient heat dissipation, and a surrounding part made of structurally stronger material. This segmentation allows each part to optimize its function - the cavity part handles thermal management while the surrounding part provides structural support, resolving the contradiction between heat dissipation and structural integrity
Solution Approach 2:
The insert uses composite construction with two different materials (niobium/tantalum for the cavity and another material for the surrounding part) joined together. This composite approach combines the high thermal conductivity of niobium/tantalum with the structural strength of the other material, enabling the system to withstand higher beam intensities without window damage while efficiently dissipating heat from the target material
2Temperature
If the cavity wall is made thin to improve heat flow out of the cavity, then the thermal exchange efficiency is improved, but the wall becomes porous when using silver material which compromises structural integrity
Solution Approach 1:
The material parameter of the cavity wall is changed from silver to niobium or tantalum. These materials maintain high thermal conductivity even at thin wall thicknesses without developing porosity issues. This parameter change allows the cavity wall to be made thinner for improved heat flow while maintaining structural integrity and reliability
3Device complexity
If a single-material insert design is used, then the device complexity is reduced, but the ability to optimize both thermal conductivity and structural strength simultaneously is limited
Solution Approach 1:
Different parts of the insert are assigned different materials based on their specific functional requirements. The cavity part uses niobium or tantalum for optimal thermal conductivity, while the surrounding part uses material optimized for structural strength. This local quality differentiation allows each region to perform its function optimally without compromising the other
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables higher yields of radioisotopes with efficient heat dissipation and reduced maintenance risks, allowing for longer cavities and more efficient use of cyclotron capabilities, even at lower target material filling ratios.
Implementation Method 1
The part comprising the cavity is made of niobium or tantalum for high thermal conductivity
Implementation Method 2
allowing for internal cooling and improved thermal exchange
Implementation Method 3
Through the interaction of said particles with the said target material, a nuclear reaction occurs which leads to the production of the radioisotope of interest
Implementation Method 4
The insert is made of at least two parts, assembled together... allowing for internal cooling
Data Source
AI summary
The present invention is related to an irradiation cell for producing a radioisotope of interest through the irradiation of a target material by a particle beam, comprising a metallic insert forming a cavity designed to house the target material and to be closed by an irradiation window, wherein said metallic insert comprises at least two separate metallic parts of different materials, being composed of at least a first part comprising said cavity.