UV False Positive Detector for Radiation Sensitive Devices
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Solution Overview
Problem
Radiation sensitive devices used for monitoring high energy radiation, such as X-ray, are prone to false positive signals due to sensitivity to UV light and sunlight, making it difficult to distinguish between genuine and false readings, and vulnerable to tampering.
Innovation Solution
A radiation detector with removable opaque layers that differentiate between UV and high energy radiation exposure by comparing color changes under and over the layers, allowing for visual or quantitative assessment using a color reference chart, optical densitometer, or spectrophotometer, and internal indicators to monitor tampering and false signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If UV absorbers are added to the coating formulation and UV absorbing film is applied, then the sensing strip becomes less sensitive to UV light, but the sensing strip remains sensitive to prolonged exposure to UV and sunlight
Solution Approach 1:
The sensing strip is divided into two distinct regions: a first region with UV protection (coating formulation containing UV absorbers) and a second region without UV protection (control region). This segmentation allows comparison between UV-protected and UV-exposed areas to detect false positives caused by UV/sunlight exposure while maintaining reliable high energy radiation detection.
2Measurement precision
If the sensing strip is made highly sensitive to detect low dose radiation, then detection capability is improved, but the likelihood of false positive signals from UV exposure increases
Solution Approach 1:
The first region acts as an intermediary control mechanism. By comparing the color change in the second region (exposed to both high energy radiation and UV) with the first region (protected from UV), the system can distinguish whether color changes are due to genuine high energy radiation exposure or false UV-induced signals, thereby maintaining high detection sensitivity while filtering UV interference.
3Device complexity
If a single sensing region is used, then the device structure is simple, but the ability to distinguish between genuine and false positive signals is lost
Solution Approach 1:
Different regions of the sensing strip are assigned different UV protection qualities: the first region has UV-protective coating to serve as a control, while the second region lacks UV protection to detect total exposure. This local quality differentiation enables the strip to simultaneously monitor both UV-protected and UV-exposed responses, providing the information needed to distinguish genuine radiation signals from false positives without significantly increasing overall device complexity.
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 accurate differentiation between genuine and false positive signals, and detects tampering by correlating color changes with specific radiation types, ensuring reliable monitoring of high energy radiation exposure while minimizing false readings.
Implementation Method 1
a sensor capable of changing optical density in response to exposure to high energy radiation and UV light
Implementation Method 2
a removable layer covering a portion of the sensor, wherein the removable layer is opaque to UV light
Data Source
AI summary
Disclosed is a detector for monitoring a UV false positive from genuine X-ray positive of color developing radiation sensitive devices. A layer which can be scratched off and is opaque to undesired radiation but transparent to X-ray is printed on the sensor. If the sensor displays a signal (i.e., develops color), whether it is genuine or false positive can be confirmed by scratching off the opaque layer. If the signal is a genuine positive, the whole sensor will be uniformly exposed/colored including the area under the opaque layer. If it is a false positive, the area under the scratched off layer will be of lighter color than the rest of the sensor.