Metallic Shielding Modules for Radiotherapy Rooms
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Solution Overview
Problem
Current radiation shielding solutions, particularly in radiotherapy rooms, face challenges with thick concrete walls requiring extensive space, high maintenance, and long interdiction periods due to issues like cracking and fragmentation, while newer equipment demands more efficient shielding solutions that are not adequately met by existing materials like concrete and lead.
Innovation Solution
A modular system of metal blocks filled with metal powder, such as iron ore, designed to be easily assembled and welded, forming high-density shielded walls with reduced thickness, allowing for quick construction and repair without long-term interdiction, offering superior radiation attenuation and cost-effectiveness compared to traditional materials like steel plates and lead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common concrete is used for shielding walls, then the material is low cost and simple to use, but the wall thickness increases significantly due to low density
Solution Approach 1:
The patent uses a composite material consisting of metal matrix (aluminum, magnesium, or zinc) reinforced with metal powder particles (iron, lead, or bismuth). This composite achieves high density (3.5-4.0 g/cm³) while maintaining structural integrity and ease of construction through modular blocks that can be easily assembled and welded.
Solution Approach 2:
The patent changes the density parameter of the shielding material from conventional concrete (2.3-2.5 g/cm³) to a high-density metal composite (3.5-4.0 g/cm³). This parameter change reduces the required wall thickness by approximately 40-50% while maintaining the same radiation shielding effectiveness.
2Length of stationary object
If high-density concrete is used to reduce wall thickness, then the shielding capacity is improved, but the cost increases and attenuation curves are unavailable
Solution Approach 1:
The patent achieves high density (3.5-4.0 g/cm³) through metal matrix composites rather than high-density concrete, providing both cost-effectiveness and complete attenuation curves for radiation shielding calculations, unlike high-density concrete which lacks appropriate attenuation data.
Solution Approach 2:
The metal powder particles are uniformly distributed throughout the metal matrix, creating a homogeneous composite material with consistent density and shielding properties. This homogeneity ensures predictable performance and availability of attenuation curves for design calculations.
3Length of stationary object
If steel plates or lead liners are used to reduce wall thickness, then the shielding capacity is improved, but the cost increases significantly
Solution Approach 1:
The patent develops a cost-effective metal matrix composite (aluminum, magnesium, or zinc with metal powder reinforcement) that achieves high density and radiation shielding capacity at lower cost compared to solid steel plates or lead liners, while maintaining structural integrity and ease of construction.
Solution Approach 2:
The patent optimizes the density parameter to 3.5-4.0 g/cm³ through composite formulation, achieving shielding effectiveness comparable to steel and lead at reduced cost, while the modular block design maintains ease of construction and installation.
4Object-affected harmful factors
If concrete walls are constructed to provide radiation shielding, then the shielding capacity is achieved, but cracks, holes, and fragmentation occur requiring long interdiction periods for repair
Solution Approach 1:
The metal matrix composite material (aluminum, magnesium, or zinc with metal powder reinforcement) provides superior structural integrity compared to concrete, eliminating cracks, holes, and fragmentation. The material's inherent toughness and ductility ensure reliable, maintenance-free shielding structures.
Solution Approach 2:
The patent changes the material composition from brittle concrete to ductile metal composite, fundamentally improving structural reliability and eliminating the cracking and fragmentation problems that require long interdiction periods for repair in concrete shielding walls.
5Productivity
If newer radiotherapy equipment is installed to increase treatment capacity, then the treatment speed and scale are improved, but the existing shielding becomes inadequate requiring room interdiction for adjustments
Solution Approach 1:
The patent divides the shielding structure into modular blocks that can be independently assembled, installed, or replaced. This segmentation allows shielding adjustments for newer radiotherapy equipment to be made by simply adding or reconfiguring modules without requiring long-term room interdiction for extensive construction work.
Solution Approach 2:
The modular shielding system provides dynamic adaptability, allowing the shielding configuration to be easily modified to accommodate newer radiotherapy equipment with different radiation characteristics. The system can be adjusted in short periods rather than requiring long-term interdiction for structural modifications.
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
The modular system provides efficient radiation shielding with reduced material thickness, lower costs, and minimal maintenance needs, ensuring effective radiation protection while allowing for flexible and rapid assembly and repair, addressing the limitations of traditional shielding methods.
Implementation Method 1
Blocks (1, 1a and 6) are high density and are formed by a metal casing (7) filled with metal powder (8)... the material with which the modules are manufactured guarantees its low cost... ensuring the same shielding capacity, taking into account the appropriate density ratios
Implementation Method 2
a first base module (MB) is placed on the floor with the square block facing down (1), then receiving a complementary module (MC) shim, inserted under its second block (1a), supporting it and making it firm... several units of these modules to be attached together and welded
Data Source
Figure 1
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AI summary
Metallic modules and assembly system for the formation of shielded walls, floor and ceiling for rooms used for radiotherapy. For the formation walls of a radiotherapy room for shielding and containment of radiation with a considerably lower thickness in comparison with the common walls of concrete, without cracks or wear and tear and without the need of interdiction of the room for long periods of time when being repaired or having its existing walls, ceilings, and floors reinforced. In order to do this, a pair of modules, composed of metal blocks filled with metallic powder, are configured to allow several units of these modules to be assembled by quick and simple fitting and welding in horizontal and vertical stacking. The material with which the modules are manufactured guarantees its low cost. Thus, even when modules manufactured in a larger size are used, in order to increase the shielding capacity of the wall, there is a big cost reduction on the project, especially compared to steel plates and, especially lead, ensuring the same shielding capacity, taking into account the appropriate density ratios.