Multi-Source X-Ray Irradiation Layout for Uniform Dose Delivery
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Solution Overview
Problem
X-ray sources used for irradiation have inferior dose uniformity compared to isotopic sources due to their broad Bremsstrahlung radiation spectrum, leading to less effective treatment of objects and materials, and pose radiological security risks due to continuous radiation emission.
Innovation Solution
An irradiation apparatus with a shielded housing and a plurality of ionizing radiation source points distributed around an irradiation volume, allowing for more uniform dose distribution and easier heat dissipation, while also enabling independent control of each source point for optimized radiation delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If isotopic sources (Cs-137, Co-60) are used for irradiation, then dose uniformity is improved, but device complexity and security requirements increase
Solution Approach 1:
The isotopic source is segmented into multiple discrete source points arranged in an array around the irradiation volume. This segmentation allows the system to achieve uniform dose distribution through geometric arrangement while using lower-energy, safer X-ray sources instead of requiring complex isotopic facilities with extensive shielding and security.
2Adaptability or versatility
If X-ray sources are used for irradiation, then device portability and security are improved, but dose uniformity deteriorates
Solution Approach 1:
The X-ray source is divided into multiple source points arranged in a three-dimensional array around the irradiation volume. This segmentation enables portable X-ray sources to achieve uniform dose distribution by radiating from multiple directions, overcoming the limitation of single-source X-ray systems while maintaining portability and security advantages.
Solution Approach 2:
The source arrangement transitions from a single-point or planar configuration to a three-dimensional array surrounding the irradiation volume. This dimensional expansion allows radiation to approach samples from multiple angles and distances, achieving uniform dose distribution that compensates for the inherently non-uniform Bremsstrahlung spectrum of X-ray sources.
3Device complexity
If single X-ray source is used, then device complexity is reduced, but heat dissipation capability deteriorates
Solution Approach 1:
The heat generation problem is segmented by distributing multiple lower-power X-ray source points around the irradiation volume instead of concentrating high power in a single source. Each source point generates less heat, and the distributed arrangement allows heat to dissipate more effectively throughout the apparatus structure, avoiding the thermal management challenges of high-power single-source systems.
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 apparatus achieves a more uniform radiation dose across samples, improving treatment efficacy and reducing radiological risks by allowing for controlled and efficient radiation delivery.
Implementation Method 1
In an X-ray source the anode material re-emits the energy received from the electrons as characteristic X-ray emission lines lying on top of Bremsstrahlung radiation spectrum extending from very low energy X-ray photons up to the voltage potential applied between anode and cathode
Implementation Method 2
Typically, an ionising radiation source point (e.g. an anode of an x-ray tube) will convert less than 1% of the kinetic energy of electrons to ionising radiation, with the remainder converted to heat
Data Source
AI summary
An irradiation apparatus comprises a plurality of ionising radiation source points (122) configured to output ionising radiation. The plurality of ionising radiation source points (122) is an array distributed around an irradiation volume (140). The array of ionising radiation source points (122) is configured to direct ionising radiation inwardly to the irradiation volume (140). A transport apparatus (130) is configured to support at least one sample (138) to be irradiated. The transport apparatus (130) is configured to transport samples along a linear path through the irradiation volume (140).