Variable Dose X-ray Collimator for Vehicle Scanning
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Solution Overview
Problem
Current X-ray vehicle scanning systems fail to effectively inspect both the cab and cargo portions of vehicles without exposing occupants to unsafe high doses of radiation, as they either neglect the cab or incur excessive costs with dual-source approaches in lower energy systems.
Innovation Solution
A dual-mode X-ray transmission system with a variable energy dose rate, utilizing a collimator that modulates the X-ray beam intensity based on sensors detecting the vehicle's components, allowing safe low-dose scanning of the cab and high-dose scanning of the cargo, with rapid switching between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high energy X-ray beam is used to scan the entire vehicle including cab, then cargo inspection effectiveness is improved, but occupant radiation exposure increases to unsafe levels
Solution Approach 1:
The vehicle is segmented into two distinct zones: the cab portion containing occupants and the cargo portion containing goods. The system applies different X-ray dose rates to each zone based on real-time detection of vehicle components, enabling high-dose scanning of cargo while protecting occupants through low-dose scanning of the cab.
Solution Approach 2:
The system dynamically switches between low-dose-rate and high-dose-rate scanning modes based on the detected position of vehicle components. Sensors detect the transition from cab to cargo portions and automatically adjust the X-ray beam intensity, making the radiation dose adaptive rather than static.
2Reliability
If dual source approach is used with low-dose source for cab and high-energy source for cargo, then both safety and inspection effectiveness are improved, but system cost increases significantly
Solution Approach 1:
A single high-energy X-ray source is designed to perform multiple functions by operating in two distinct modes: low-dose-rate mode for scanning the cab portion and high-dose-rate mode for scanning the cargo portion. This eliminates the need for separate low-dose and high-dose sources, reducing system complexity and cost while maintaining safety and effectiveness.
Solution Approach 2:
The system changes the operational parameters of the X-ray source, specifically the dose rate, based on the scanning region. By modulating the beam intensity through a collimator and controlling the dose rate dynamically, the same source can safely scan occupants and effectively scan cargo without requiring multiple sources.
3Measurement precision
If high dose rate is applied to scan cargo portion, then material penetration and detection capability are improved, but the same dose rate is harmful to occupants in the cab
Solution Approach 1:
A collimator is introduced as an intermediary component between the X-ray source and the vehicle. The collimator modulates the X-ray beam, allowing it to be focused and intensity-adjusted for different regions. This intermediary enables the system to deliver high-dose beams to cargo while directing low-dose beams to the cab, resolving the conflict between detection capability and occupant safety.
4Object-affected harmful factors
If low dose rate is used to ensure occupant safety during cab scanning, then radiation exposure is reduced, but inspection effectiveness for the cab portion is compromised
Solution Approach 1:
The system applies partial action by using low-dose-rate scanning specifically for the cab portion where occupants are present, and excessive action (high-dose-rate scanning) for the cargo portion where no occupants are present. This selective application of dose rates optimizes both safety and inspection effectiveness for each respective zone.
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
Enables safe and effective scanning of both the cab and cargo portions of vehicles, balancing material penetration and occupant safety by varying the X-ray dose rate, reducing exposure risks and operational costs.
Implementation Method 1
a collimator that modulates the intensity of X-ray beam to produce low or high X-ray energy dose rate depending upon the portion of the vehicle being screened
Implementation Method 2
an X-ray source for generating an X-ray beam
Data Source
AI summary
A variable mode X-ray transmission system is provided that can be operated in low or high dose rate modes depending upon the area or portion of the vehicle to be screened. In one embodiment, variable dose rate is achieved by use of a novel collimator. The systems disclosed in this application enable the scanning of a vehicle cab portion (occupied by people, such as a driver) at low dose rate, which is safe for human beings, while allowing the scanning of the cargo portion (unoccupied by people) at a high dose rate. Rapid switching from low dose rate to high dose rate operating mode is provided, while striking a balance between high material penetration for cargo portion and low intensity exposure that is safe for occupants in the cab portion of the inspected vehicle.