Movable Neutron Generator Reflector for Easy Replacement
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Solution Overview
Problem
Conventional neutron generators in accelerator-based boron neutron capture therapy systems are difficult to replace due to their integration within the moderator, leading to challenges in maintaining neutron beam quality and reducing radiation damage to normal tissues.
Innovation Solution
A beam shaping assembly with a movable member that allows the neutron generator to be easily replaced by moving between a first position for replacement and a second position where it is irreplaceable, incorporating a reflector and moderator to enhance epithermal neutron beam intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the neutron generator is integrated within the moderator for compact design, then the device complexity is reduced, but the ease of repair deteriorates as the neutron generator cannot be easily replaced
Solution Approach 1:
The beam shaping assembly is segmented into a stationary moderator and a movable reflector assembly. The neutron generator is integrated with the reflector, forming a separable module that can be moved as a unit. This segmentation allows the neutron generator to remain integrated in the overall structure while enabling easy replacement through movement of the entire reflector assembly.
Solution Approach 2:
The reflector assembly is designed to be movable relative to the moderator, transforming the static integrated structure into a dynamic system. The reflector can be positioned in a first position for neutron generation therapy and a second position for replacement, allowing the system to switch between operational and maintenance states without structural reconfiguration.
2Reliability
If the neutron generator is replaced periodically to maintain neutron beam quality, then the reliability is improved, but the loss of time increases due to complex replacement procedures
Solution Approach 1:
The movable reflector assembly enables rapid replacement of the neutron generator by allowing the entire reflector module to be quickly repositioned between operational and replacement positions, significantly reducing the time required for generator replacement compared to disassembling a fixed structure.
Solution Approach 2:
The system is designed with the reflector assembly pre-configured for easy movement, so that when neutron generator replacement is needed, the replacement procedure can be initiated immediately without complex preparation or disassembly steps, minimizing downtime.
3Quantity of substance
If a cylindrical moderator with deep neutron generator integration is used, then the epithermal neutron beam intensity is enhanced, but the ease of operation deteriorates as the neutron generator becomes difficult to access for replacement
Solution Approach 1:
The system separates the moderator (which provides the cylindrical structure for neutron enhancement) from the neutron generator (integrated with the movable reflector). This segmentation allows the generator to be deeply integrated for optimal neutron moderation while maintaining accessibility through the movable reflector assembly's ability to be repositioned for replacement.
Solution Approach 2:
The movable reflector assembly dynamically changes the accessibility of the neutron generator. During operation, the reflector is in the first position where the generator is deeply integrated with the moderator for optimal neutron enhancement. For replacement, the reflector moves to the second position, making the generator easily accessible without compromising the cylindrical moderator structure.
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
Facilitates easy replacement of the neutron generator, maintaining neutron beam quality and reducing radiation damage to normal tissues, thereby improving the effectiveness of neutron capture therapy.
Implementation Method 1
the neutron generator has nuclear reaction with an incident proton beam from the beam inlet to produce neutrons
Implementation Method 2
the neutrons are moderated by the moderator to epithermal neutron energies
Implementation Method 3
the reflector leads the deflected neutrons back to enhance the epithermal neutron beam intensity
Data Source
AI summary
The present disclosure provides a neutron capture therapy system including a beam shaping assembly. The beam shaping assembly includes a beam inlet; a neutron generator arranged into the beam shaping assembly, the neutron generator has nuclear reaction with an incident proton beam from the beam inlet to produce neutrons; a moderator adjacent to the neutron generator, the neutrons are moderated by the moderator to epithermal neutron energies; a reflector surrounding the neutron generator and the moderator, the reflector leads the deflected neutrons back to enhance epithermal neutron beam intensity; a beam outlet; and at least a movable member moving away from or close to the neutron generator, the movable member moves between a first position where the neutron generator is replaceable, and a second position where the neutron generator is irreplaceable. The neutron capture therapy system has a simple structure, and the neutron generator is easy to be replaced.