Segmented Conveyor Radiation Shielding for Parcel Scanners
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Solution Overview
Problem
Conventional radiation-based article inspection systems face challenges in efficiently containing radiation emissions while maintaining high throughput, particularly with the introduction of higher intensity CT scanners that require more extensive radiation shielding and faster scanning speeds, leading to increased radiation leakage and reduced system efficiency.
Innovation Solution
The implementation of a segmented conveyor system with varying conveyor speeds and strategically arranged radiation shielding curtains, where articles are conveyed at different speeds through different zones to optimize gap distances and ensure that a sufficient number of curtains are always in a down position, thereby controlling radiation leakage while maintaining high throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If more layers of radiation shielding are used to contain higher intensity radiation from CT scanners, then radiation containment is improved, but system length increases and throughput efficiency deteriorates
Solution Approach 1:
The shielding system is divided into multiple segments or zones along the conveyor path. Instead of using a single long shielding structure, the patent employs distributed shielding elements positioned at strategic locations, allowing radiation containment while maintaining a compact system footprint and enabling faster article throughput.
Solution Approach 2:
The patent introduces dynamic adjustment capabilities to the shielding system, allowing the shielding configuration to adapt based on real-time conditions such as article type, radiation intensity levels, and conveyor speed. This dynamic optimization enables effective radiation containment without requiring maximum shielding length at all times, thus improving throughput efficiency.
2Productivity
If conveyor speed is increased to improve throughput, then productivity is improved, but radiation leakage increases due to reduced gap distance between articles
Solution Approach 1:
The patent employs dynamic control of conveyor speed and shielding position based on real-time monitoring of article spacing. When articles are detected at reduced gaps, the system dynamically adjusts shielding deployment or conveyor pacing to maintain radiation containment while minimizing throughput impact. This dynamic adaptation allows high-speed operation when conditions permit while preventing radiation leakage when gaps are insufficient.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor article spacing, conveyor speed, and radiation levels in real-time. This feedback loop enables automatic adjustment of shielding and conveyor parameters to maintain optimal operation, allowing high throughput when article gaps are sufficient while automatically reducing speed or increasing shielding when gaps become too small, thereby preventing radiation leakage.
3Object-affected harmful factors
If rigid radiation shielding is used to contain radiation, then radiation containment is improved, but ease of operation deteriorates due to restricted article ingress and egress
Solution Approach 1:
The patent replaces rigid shielding structures with flexible shielding curtains or films that can dynamically adjust their position. These flexible shielding elements can be drawn across the conveyor path when radiation containment is needed and retracted when articles need to pass through, providing effective radiation containment while maintaining smooth article ingress and egress operations.
Solution Approach 2:
The shielding system transitions from static rigid structures to dynamic flexible elements that can move and adapt. The flexible shielding curtains can be rapidly deployed and retracted based on real-time operational requirements, allowing unrestricted article movement when shielding is not needed while providing immediate radiation containment when required, thus improving ease of operation.
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 approach effectively limits radiation leakage, achieves high throughput, and reduces system length, ensuring that at least two curtains are always in a down position to contain radiation emissions within acceptable levels, even with higher powered CT scanning systems.
Implementation Method 1
Some conventional x-ray projection based scanners, for example, those in use in airport since the 1970's
Implementation Method 2
The curtains may decrease an amount of radiation escaping for a system scanning a stream of articles
Data Source
AI summary
A scanning system includes an improved arrangement of shielding curtains to limit radiation leakage while achieving high throughput and limiting system length. The scanning system includes a segmented conveyor, including a faster conveyor through a shielding region to improve increase throughput of scanned articles, and a slower conveyor through a scanning region to ensure acceptable scanning performance. The curtains are arranged based on the changing gap distance between the articles that results from the changing conveyor speeds.