Radiation Target Assembly With Layered Heat Dissipation

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Solution Overview

Problem

Existing radiation targets in electron linear accelerators suffer from instability, short service life, and high electron leakage due to high temperature and energy deposition during X-ray generation, necessitating improved heat dissipation and electron management.

Innovation Solution

A radiation target assembly with a heat dissipation assembly thermally connected to its back surface, where the thickness is determined based on the peak energy deposition, enhancing heat dissipation and reducing temperature gradients.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the radiation target uses a thick target material to absorb electrons and generate photons, then the electron leakage is reduced and photon generation is improved, but the heat accumulation increases and service life decreases

Engineering Contradiction:

Improveservice lifeVSAvoidheat accumulation

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The radiation target is divided into multiple thin target material layers (e.g., 3-5 layers) instead of a single thick layer. Each layer has a thickness of 0.01-0.05mm, which segments the heat generation and dissipation processes, allowing heat to be more effectively managed while maintaining sufficient electron absorption and photon generation capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A heat dissipation layer made of high thermal conductivity material (such as copper or graphite) is introduced as an intermediary between the target material layers. This heat dissipation layer acts as a thermal conductor to rapidly transfer heat away from the target material, reducing heat accumulation and protecting the target from thermal damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the radiation target material thickness is increased to reduce electron leakage, then electron absorption is improved, but heat dissipation becomes more difficult and stability decreases

Engineering Contradiction:

ImprovestabilityVSAvoidheat generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The target material is segmented into multiple thin layers with total thickness optimized for electron absorption. This segmentation reduces the heat generation in each individual layer while maintaining the overall electron stopping power, thereby improving stability by reducing thermal stress and heat accumulation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The radiation target uses a composite structure combining target material layers (for photon generation) with heat dissipation layers (for thermal management). This composite design allows the system to simultaneously achieve effective electron absorption, efficient heat dissipation, and improved operational stability.

Inventive Principle:

Principle #40Composite materials

3Productivity

If the target material thickness is optimized for peak energy deposition, then photon generation efficiency is improved, but heat concentration at specific depths increases

Engineering Contradiction:

Improvephoton generation efficiencyVSAvoidheat concentration

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The target material is divided into multiple thin layers, each contributing to photon generation while distributing the heat generation across different depths. This segmentation prevents excessive heat concentration at any single depth while maintaining the overall photon generation efficiency through optimized total thickness and layer configuration.

Inventive Principle:

Principle #1Segmentation

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 solution increases the service life and stability of the radiation target by effectively managing heat and reducing electron leakage, ensuring efficient photon generation without compromising dose rate.

Implementation Method 1

a radiation target assembly configured to generate radiation rays under irradiation of an electron beam with a predetermined energy

Methodology Applied

Scientific EffectBremsstrahlung:

Implementation Method 2

a heat dissipation assembly thermally connected with the radiation target assembly... The thermal conductive material may be used for transfer of heat generated in the radiation target, reducing the temperature of the target

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12476068B2Devices for radiation ray generation and radiation apparatuses

Publication Date: 2025.11.18 SHANGHAI UNITED IMAGING HEALTHCARE

AI summary

The present disclosure provides a device and an equipment for radiation ray generation. The device may include: a radiation target assembly configured to generate radiation rays under irradiation of an electron beam with a predetermined energy; and a heat dissipation assembly arranged on a back surface of the radiation target assembly, wherein a range of a thickness of the target assembly may be determined based on a peak of energy deposition of a target material of the radiation target assembly under the irradiation of the electron beam with the predetermined energy.