Tamper-Resistant Radiation Dosimeter via Polymer Encapsulation
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Solution Overview
Problem
Existing radiation sensitive dosimeters, such as SIRAD badges, are not tamper resistant due to the use of pressure sensitive adhesives, which can be easily compromised, and there is a lack of radiation sensitive smart cards that can withstand high-energy radiation monitoring.
Innovation Solution
A tamper-resistant, radiation monitoring device is created by encapsulating a radiation sensitive coating or strip in a polymeric material, forming a unitary, directly readable card with a polymer matrix that changes color in response to radiation energy, incorporating UV blocking materials to prevent damage and allow observation of color changes, and using a core layer made from materials like polyurethane, polyepoxy, or polyester to prevent separation and ensure durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pressure sensitive adhesive is used to sandwich the radiation sensitive coating between plastic layers, then the dosimeter can be easily manufactured and assembled, but the device becomes vulnerable to tampering and lacks tamper resistance
Solution Approach 1:
The patent merges the radiation sensitive coating with the plastic layers by co-molding them as a single integrated unit. The radiation sensitive material is incorporated into the polymer matrix during the molding process, eliminating the need for separate adhesive layers and creating a tamper-resistant monolithic structure that cannot be separated without destruction.
Solution Approach 2:
The patent uses composite materials by integrating the radiation sensitive coating into the plastic matrix during molding. This creates a composite structure where the radiation sensitive material and polymer are combined at a molecular level, providing both structural integrity and tamper resistance while maintaining the radiation detection functionality.
2Measurement precision
If the radiation sensitive material is exposed to UV radiation, then it can detect radiation effectively, but UV radiation damages the material and prevents accurate monitoring
Solution Approach 1:
The patent applies local quality by creating a selective optical filter structure where different regions have different properties. The UV blocking layer is positioned specifically between the radiation source and the radiation sensitive material, allowing it to block harmful UV wavelengths while permitting higher energy radiation (X-rays, gamma rays, electrons) to reach the detection material for accurate measurement.
Solution Approach 2:
The patent introduces an intermediary UV blocking layer that mediates between the radiation environment and the radiation sensitive material. This intermediary layer selectively filters out harmful UV radiation while allowing the desired high-energy radiation to pass through, protecting the material from degradation while maintaining detection accuracy.
3Device complexity
If the dosimeter uses multiple separate layers with adhesive, then it allows flexible assembly, but the layers can separate and the device lacks environmental resistance
Solution Approach 1:
The patent merges multiple separate layers into a single monolithic structure through co-molding. The radiation sensitive coating, plastic layers, and UV blocking components are integrated during the molding process to form one unified piece that cannot be separated without destruction, providing both environmental resistance and tamper resistance while eliminating adhesive-related failure modes.
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 provides a tamper-resistant, environmentally resistant SIRAD card that can accurately monitor high-energy radiation exposure by preventing water and liquid diffusion, ensuring the radiation sensitive material's integrity, and allowing for rapid and accurate dose estimation through color changes, while being cost-effective and less prone to damage.
Implementation Method 1
a radiation sensitive coating or strip (114) embedded in a core (112) so that the radiation sensitive material changes color in response to radiation energy
Implementation Method 2
There is further provided means for preventing ultraviolet radiation from reaching the monitoring component while permitting passage of higher energy radiation
Data Source
AI summary
A tamper resistant and evident, self indicating instant radiation alert dosimeter (referred to as SIRAD) made by encapsulating a radiation sensing system in a polymeric material is disclosed. SIRAD is made from many layers of polymeric materials by multi-step processes. The radiation sensing system of SIRAD is encapsulated in a polymeric media made by a casting or reaction injection molding process.