Multidiameter Elution Capsule for Simultaneous Irradiation and Elution
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Solution Overview
Problem
The existing methods for producing technetium-99m, a radionuclide used in nuclear medical imaging, require a two-step process involving irradiation and subsequent elution, which is inefficient due to the short half-life of technetium-99m and the complexity of the process.
Innovation Solution
A multidiameter elution capsule with specific internal structures and materials is designed for irradiation and elution, featuring a hollow cylindrical tube with varying diameters, washers, filters, and end caps to facilitate neutron irradiation and subsequent elution of technetium-99m ions using a saline solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-step process (irradiation then elution) is used to produce technetium-99m, then the radionuclide can be obtained, but the process is inefficient due to the short half-life of technetium-99m and the complexity of the process
Solution Approach 1:
The patent combines the irradiation and elution functions into a single integrated capsule structure. The capsule contains both the irradiated material (titanium molybdate) and the elution column with ion exchange resin, allowing the entire process to occur within one device rather than requiring separate irradiation and elution steps.
Solution Approach 2:
The capsule serves multiple functions simultaneously: it acts as a reactor component for irradiation, contains the target material for neutron capture, provides a column structure for elution, and includes filtering mechanisms. This multi-functional design eliminates the need for separate devices for each process step.
2Duration of action of moving object
If technetium-99m is produced through irradiation of titanium molybdate, then the radionuclide is generated, but the short half-life of 6 hours requires rapid processing and reduces available time for transport and administration
Solution Approach 1:
The capsule is designed to perform elution automatically or semi-automatically upon removal from the reactor, eliminating the need for separate elution steps after irradiation. The ion exchange resin is pre-positioned in the column structure, ready to immediately capture and release technetium-99m when the capsule is removed from the neutron flux.
Solution Approach 2:
The capsule structure enables self-contained production and elution of technetium-99m. The irradiated material and elution column work together within the same device, allowing the system to complete the entire production cycle without external intervention or separate processing steps.
3Productivity
If saline is passed through irradiated titanium molybdate to remove technetium-99m ions, then the radionuclide is eluted, but the existing method requires separate irradiation and elution steps reducing overall efficiency
Solution Approach 1:
The patent merges the irradiation chamber and elution column into a single integrated capsule. The middle portion of the capsule contains both the irradiated titanium molybdate and the ion exchange resin column, allowing saline to flow through the same structure that was just irradiated, eliminating the need for separate irradiation and elution devices.
Solution Approach 2:
The elution column with ion exchange resin is nested within the irradiation capsule structure. The resin column is positioned inside the capsule body, allowing it to be contained within the same device that undergoes irradiation, creating a compact integrated system where one structure houses multiple functional components.
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 allows for efficient irradiation and elution of technetium-99m within a nuclear reactor, simplifying the process and ensuring effective removal of ions, thereby addressing the inefficiencies of the existing methods.
Implementation Method 1
designed to fit within a nuclear reactor's neutron flux so that a material within the capsule may be irradiated in the reactor's core
Implementation Method 2
used as an elution column to remove ions from within the capsule that were generated by the irradiation decay process
Implementation Method 3
Molybdenum-98 within the titanium molybdate absorbs a neutron during the irradiation process and becomes molybdenum-99 (Mo-99). Mo-99 is unstable and decays with a 66-hour half-life to technetium-99m
Implementation Method 4
Mo-99 is unstable and decays with a 66-hour half-life to technetium-99m (m is metastable)
Data Source
AI summary
A capsule for holding, irradiating, and eluting a material is provided. Methods of fabricating and using the capsule are also provided. The capsule may include a multidiameter tube with a first end region, a second end region, and a middle region. Washers and filters are provided in the end regions and the end regions may be sealed using various methods and materials with the end caps press fit into the end regions. The middle region is designed to store a material to be irradiated by a neutron flux source. The capsule components may be made from materials having a low nuclear cross section so that the capsule may be handled safely after an irradiation step is performed. The capsule is also designed to have a symmetric configuration as an elution and irradiation column so that the same capsule may be used to elute the material within the middle region of the capsule after an irradiation step is performed.