Brachytherapy Target Holding Device for Uniform Activity
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Solution Overview
Problem
The production of brachytherapy seeds with uniform activity is challenging due to flux variations in nuclear reactors, making it difficult to achieve consistent radiation levels for cancer treatment.
Innovation Solution
A target holding device comprising multiple target plates and separator plates with low cross-section materials, arranged to form compartments, and connected by a shaft and cable, allowing for precise alignment and uniform exposure within a reactor core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If long wires are irradiated in a nuclear reactor to produce brachytherapy seeds, then the production efficiency is improved, but the uniformity of activity across seeds deteriorates due to flux variations
Solution Approach 1:
The patent divides the target into multiple thin target plates stacked together, each plate containing multiple holes for seed formation. This segmentation allows each plate to be exposed to more uniform neutron flux independently, and the stacking arrangement ensures all plates receive similar exposure conditions, thereby achieving uniform activity across all seeds while maintaining high production efficiency through parallel processing of multiple seeds simultaneously
Solution Approach 2:
The patent transitions from irradiating long wires in one dimension to stacking multiple thin plates in three dimensions. The plates are arranged with precise spacing and alignment, creating a three-dimensional structure that optimizes neutron flux distribution. This dimensional change allows better control over exposure uniformity while maintaining high productivity through the multi-plate configuration
2Productivity
If target plates are stacked closely to increase target density, then the productivity is improved, but the alignment precision deteriorates making uniform exposure difficult
Solution Approach 1:
The patent incorporates alignment features directly into the target plate structure during manufacturing, including protrusions and recesses that automatically guide proper positioning when plates are stacked. This preliminary preparation of alignment mechanisms ensures that when multiple plates are assembled, they automatically achieve precise alignment without requiring complex external alignment procedures, thus maintaining both high density and precision
Solution Approach 2:
The patent uses visual indicators such as colored markings or contrasting patterns on the target plates to indicate proper orientation and alignment. These visual cues allow operators to quickly verify correct positioning during assembly, ensuring that plates are stacked with the required precision for uniform neutron exposure while maintaining high target density through close stacking
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
Enables the production of brachytherapy and radiography targets with relatively uniform activity, ensuring effective tumor treatment while minimizing damage to surrounding tissues.
Implementation Method 1
The target plates may be formed of different materials having low cross sections relative to that of targets held by the device
Data Source
AI summary
A target holding device according to an embodiment of the invention includes a plurality of target plates, each target plate having a first surface and an opposing second surface, wherein the first surface has a plurality of holes. A shaft may be used to facilitate the alignment and joinder of the target plates such that the first surface of one target plate contacts a second surface of an adjacent target plate. The target holding device may optionally include end plates arranged to sandwich the target plates therebetween and/or separator plates alternately arranged with the target plates. The target holding device may be used to produce brachytherapy and/or radiography targets (e.g., seeds, wafers) in a reactor core such that the targets have relatively uniform activity.